/** FormCollect - Compiles a string of form data. - brad@xkr.us - 2004-10-20 **
 ** Code licensed under Creative Commons Attribution-ShareAlike License      **
 ** http://creativecommons.org/licenses/by-sa/2.0/                           **/
function FormCollect(oForm)
{
	var sRetval='', sTemp='', sCTName='', sCName='', sCType='', arrElts=[],
		oCurrent=null;
	for (var i=oForm.elements.length-1; i >= 0; i--)
	{
		oCurrent = oForm.elements[i];
		/* successful elements must have a name and must not be disabled */
		if (oCurrent.name && !oCurrent.disabled) arrElts.push(oCurrent);
	}
	
	/* sort elements so same names will be adjacent to each other */
	arrElts.sort(function(a,b){return ((a.name<b.name)?1:(a.name==b.name)?0:-1);});
	
	while (oCurrent = arrElts.pop())
	{
		sCTName = oCurrent.tagName.toLowerCase();
		sCName = oCurrent.name.toLowerCase();
		sCType = ((oCurrent.type)?oCurrent.type:'').toLowerCase();
		
		/* handle input[type="radio|checkbox"] */
		if (sCTName == "input" && /^(?:radio|checkbox)$/.test(sCType))
		{
			do {
				if (oCurrent.checked || oCurrent.selected)
					sRetval = sRetval.append(encodeURIComponent(oCurrent.name) + '=' +
						encodeURIComponent(oCurrent.value), '&');
			} while (arrElts[arrElts.length-1].name == oCurrent.name &&
				(oCurrent = arrElts.pop()));
		}
		
		/* handle select[multiple] */
		if (sCTName == "select" && oCurrent.multiple && oCurrent.options)
		{
			for (i=0,len=oCurrent.options.length,sTemp=''; i < len; i++)
				if (oCurrent.options[i].selected)
					sTemp = sTemp.append(encodeURIComponent(oCurrent.options[i].value),
						',');
			sRetval = sRetval.append(encodeURIComponent(oCurrent.name) + '=' +
				sTemp, '&');
		}
		/* any other element */
		else if ((sCTName == "input" &&
			/^(?:text|password|hidden)$/.test(sCType)) ||
			/^(?:select|textarea)$/.test(sCTName))
		{
			sRetval = sRetval.append(encodeURIComponent(oCurrent.name) + '=' +
				encodeURIComponent(oCurrent.value), '&');
		}
	}
	return sRetval;
}
String.prototype.append = function(sAdd, sSep)
{
	return this + ((this.length)?sSep:'') + sAdd;
}