//
// Used to toggle visiblity of the 'other text' textbox row for a question.
//
function showOtherRow(blnShow, rowId, txtOther)
{
    if (blnShow)
    {
        document.getElementById(rowId).style.display = '';
    }
    else
    {
        document.getElementById(rowId).style.display = 'none';
        document.getElementById(txtOther).value = '';
    }
}

//
// Called when a dropdown has an item selected which has an 'other text' textbox associated with it.
//
function ddlChanged(ddl, otherid, rowId, txtOther)
{
    if (ddl != null)
    {
        if (ddl.options[ddl.selectedIndex].value == otherid)
        {
            document.getElementById(rowId).style.display = '';
        }
        else
        {
            document.getElementById(rowId).style.display = 'none';
            document.getElementById(txtOther).value = '';
        }
    }
}

//
// Glue to make the asp.net radiobutton groupnames work.
//
function SetUniqueRadioButton(nameregex, current)
{
   re = new RegExp(nameregex);
   for(i = 0; i < document.forms[0].elements.length; i++)
   {
      elm = document.forms[0].elements[i]
      if (elm.type == 'radio')
      {
         if (re.test(elm.name))
         {
            elm.checked = false;
         }
      }
   }
   current.checked = true;
}

//
// shows or hides the metric/imperial measurements
//
function showHeightWeightDiv(visdiv, hiddiv, imp1, imp2, met1, met2, type, reset)
{
    document.getElementById(visdiv).style.display = "block";
    document.getElementById(hiddiv).style.display = "none";
    
    if (reset)
    {
        if (type == 1)
        {
            document.getElementById(met1).selectedIndex = 0;
            document.getElementById(met2).selectedIndex = 0;
            document.getElementById(met2).style.display = '';
        }
        else
        {
            document.getElementById(imp1).selectedIndex = 0;
            document.getElementById(imp2).selectedIndex = 0;
            document.getElementById(imp2).style.display = '';
        }
    }
}


//
// Called when a matrix dropdown has an item selected and the use/satisfy dropdowns need showing
//
function ddlMatrixChanged(ddl, yesid, ddlUse, ddlSatisfy)
{
    if (ddl != null)
    {
        if (ddl.options[ddl.selectedIndex].value == yesid)
        {
            document.getElementById(ddlUse).style.display = '';
        }
        else
        {
            document.getElementById(ddlUse).style.display = 'none';
            document.getElementById(ddlUse).selectedIndex = "0";
            document.getElementById(ddlSatisfy).style.display = 'none';
            document.getElementById(ddlSatisfy).selectedIndex = "0";
        }
    }
}

//
// Called when a matrix dropdown has an item selected and the use/satisfy dropdowns need showing
//
function ddlMatrixUseChanged(ddlUse, yesid, usedtoid, ddlSatisfy)
{
    if (ddlUse != null)
    {
        if (ddlUse.options[ddlUse.selectedIndex].value == yesid || ddlUse.options[ddlUse.selectedIndex].value == usedtoid)
        {
            document.getElementById(ddlSatisfy).style.display = '';
        }
        else
        {
            document.getElementById(ddlSatisfy).style.display = 'none';
            document.getElementById(ddlSatisfy).selectedIndex = "0";
        }
    }
}

//
// Called when a matrix dropdown has an item selected and the use/satisfy dropdowns need showing
//
function showDontKnow(ddl, ddlOther, dontknowval)
{
    if (ddl != null)
    {
        if (ddl.options[ddl.selectedIndex].value == dontknowval)
        {
            document.getElementById(ddlOther).style.display = 'none';
            document.getElementById(ddlOther).selectedIndex = 0;
        }
        else
        {
            document.getElementById(ddlOther).style.display = '';
        }
    }
}

//
// Show or hide the question help.
//
function showQuestionHelp(div)
{
    var d = document.getElementById(div);
    
    if (d.style.display == 'none')
    {
        d.style.display = 'block';
    }
    else
    {
        d.style.display = 'none';
    }
}


/**
*
*  Base64 encode / decode
*  http://www.webtoolkit.info/
*
**/
 
var Base64 = {
 
	// private property
	_keyStr : "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=",
 
	// public method for encoding
	encode : function (input) {
		var output = "";
		var chr1, chr2, chr3, enc1, enc2, enc3, enc4;
		var i = 0;
 
		input = Base64._utf8_encode(input);
 
		while (i < input.length) {
 
			chr1 = input.charCodeAt(i++);
			chr2 = input.charCodeAt(i++);
			chr3 = input.charCodeAt(i++);
 
			enc1 = chr1 >> 2;
			enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);
			enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);
			enc4 = chr3 & 63;
 
			if (isNaN(chr2)) {
				enc3 = enc4 = 64;
			} else if (isNaN(chr3)) {
				enc4 = 64;
			}
 
			output = output +
			this._keyStr.charAt(enc1) + this._keyStr.charAt(enc2) +
			this._keyStr.charAt(enc3) + this._keyStr.charAt(enc4);
 
		}
 
		return output;
	},
 
	// public method for decoding
	decode : function (input) {
		var output = "";
		var chr1, chr2, chr3;
		var enc1, enc2, enc3, enc4;
		var i = 0;
 
		input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");
 
		while (i < input.length) {
 
			enc1 = this._keyStr.indexOf(input.charAt(i++));
			enc2 = this._keyStr.indexOf(input.charAt(i++));
			enc3 = this._keyStr.indexOf(input.charAt(i++));
			enc4 = this._keyStr.indexOf(input.charAt(i++));
 
			chr1 = (enc1 << 2) | (enc2 >> 4);
			chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
			chr3 = ((enc3 & 3) << 6) | enc4;
 
			output = output + String.fromCharCode(chr1);
 
			if (enc3 != 64) {
				output = output + String.fromCharCode(chr2);
			}
			if (enc4 != 64) {
				output = output + String.fromCharCode(chr3);
			}
 
		}
 
		output = Base64._utf8_decode(output);
 
		return output;
 
	},
 
	// private method for UTF-8 encoding
	_utf8_encode : function (string) {
		string = string.replace(/\r\n/g,"\n");
		var utftext = "";
 
		for (var n = 0; n < string.length; n++) {
 
			var c = string.charCodeAt(n);
 
			if (c < 128) {
				utftext += String.fromCharCode(c);
			}
			else if((c > 127) && (c < 2048)) {
				utftext += String.fromCharCode((c >> 6) | 192);
				utftext += String.fromCharCode((c & 63) | 128);
			}
			else {
				utftext += String.fromCharCode((c >> 12) | 224);
				utftext += String.fromCharCode(((c >> 6) & 63) | 128);
				utftext += String.fromCharCode((c & 63) | 128);
			}
 
		}
 
		return utftext;
	},
 
	// private method for UTF-8 decoding
	_utf8_decode : function (utftext) {
		var string = "";
		var i = 0;
		var c = c1 = c2 = 0;
 
		while ( i < utftext.length ) {
 
			c = utftext.charCodeAt(i);
 
			if (c < 128) {
				string += String.fromCharCode(c);
				i++;
			}
			else if((c > 191) && (c < 224)) {
				c2 = utftext.charCodeAt(i+1);
				string += String.fromCharCode(((c & 31) << 6) | (c2 & 63));
				i += 2;
			}
			else {
				c2 = utftext.charCodeAt(i+1);
				c3 = utftext.charCodeAt(i+2);
				string += String.fromCharCode(((c & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63));
				i += 3;
			}
 
		}
 
		return string;
	}
 
}

//
// Modal lib
//
var maskpanel=function()
{
    this.divobj;
    this.show=function()
    {
      if(!document.getElementById("xdivmasking"))
      {
          var divEle=document.createElement('div');
          divEle.setAttribute("id","xdivmasking");
          document.body.appendChild(divEle);
          var divSty=document.getElementById("xdivmasking").style;
          divSty.position="absolute"; divSty.top="0px"; divSty.left="0px";
          divSty.zIndex="46"; divSty.opacity=".50";divSty.backgroundColor="#000";
          divSty.filter="alpha(opacity=50)";

          var divFram=document.createElement('iframe');
          divFram.setAttribute("id","xmaskframe");
          document.body.appendChild(divFram);
          divSty=document.getElementById("xmaskframe").style;
          divSty.position="absolute"; divSty.top="0px"; divSty.left="0px"; 
          divSty.zIndex="45";divSty.border="none";divSty.filter="alpha(opacity=0)";
       }

       this.divobj=document.getElementById("xdivmasking");
       this.waitifrm=document.getElementById("xmaskframe");
       
       var dsh=document.documentElement.scrollHeight;
       var dch=document.documentElement.clientHeight;
       var dsw=document.documentElement.scrollWidth;
       var dcw=document.documentElement.clientWidth;
       
       var bdh=(dsh>dch)?dsh:dch;
       var bdw=(dsw>dcw)?dsw:dcw;

       this.waitifrm.style.height=this.divobj.style.height=bdh+'px';
       this.waitifrm.style.width=this.divobj.style.width=bdw+'px';  
       this.waitifrm.style.display=this.divobj.style.display="block";
    };
    this.hide=function()
    {
        this.waitifrm.style.display=this.divobj.style.display="none";
    };
}


//
// helper functions for string.
// 
String.prototype.trim = function() {
	return this.replace(/^\s+|\s+$/g,"");
}
String.prototype.ltrim = function() {
	return this.replace(/^\s+/,"");
}
String.prototype.rtrim = function() {
	return this.replace(/\s+$/,"");
}
String.prototype.startsWith = function(str){
    return (this.indexOf(str) === 0);
}

//
// return the appropriate xml http object
//
function GetXmlHttpObject()
{
    if (window.XMLHttpRequest)
      {
      // code for IE7+, Firefox, Chrome, Opera, Safari
      return new XMLHttpRequest();
      }
    if (window.ActiveXObject)
      {
      // code for IE6, IE5
      return new ActiveXObject("Microsoft.XMLHTTP");
      }
    return null;
}