function validateRadiobuttonSelected(btn) 
{
    for (var i=btn.length-1; i > -1; i--) 
	{
        if (btn[i].checked) 
		{
			return true;
		}
    }
	return false;
}

function validate_required(field,alerttxt)
{
	if (field.value.length == 0)
	{
   		alert(alerttxt);
		field.style.background = 'LightYellow';
		return false;
   	}
	else
   	{
		field.style.background = 'White';
   		return true;
   	}
}


<!-- JS Email Validation (Structure Only) -->
function checkEmail(field) 
{
	if (/^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,3})+$/.test(field.value))
	{
		return true;
	}
	alert("You have entered an invalid email address. Please re-enter.");
	return false;
}

function clickclear(thisfield, defaulttext) 
{
	if (thisfield.value == defaulttext) 
	{
		thisfield.value = "";
	}
}

function clickrecall(thisfield, defaulttext) 
{
	if (thisfield.value == "") 
	{
		thisfield.value = defaulttext;
	}
}
function createEditableSelect(dest)
{
	alert('hello');
	dest.className='selectBoxInput';		
	var div = document.createElement('DIV');
	div.style.styleFloat = 'left';
	div.style.width = dest.offsetWidth + 16 + 'px';
	div.style.position = 'relative';
	div.id = 'selectBox' + selectBoxIds;
	var parent = dest.parentNode;
	parent.insertBefore(div,dest);
	div.appendChild(dest);	
	div.className='selectBox';
	div.style.zIndex = 10000 - selectBoxIds;

	var img = document.createElement('IMG');
	img.src = arrowImage;
	img.className = 'selectBoxArrow';
	
	img.onmouseover = selectBox_switchImageUrl;
	img.onmouseout = selectBox_switchImageUrl;
	img.onclick = selectBox_showOptions;
	img.id = 'arrowSelectBox' + selectBoxIds;

	div.appendChild(img);
	
	var optionDiv = document.createElement('DIV');
	optionDiv.id = 'selectBoxOptions' + selectBoxIds;
	optionDiv.className='selectBoxOptionContainer';
	optionDiv.style.width = div.offsetWidth-2 + 'px';
	div.appendChild(optionDiv);
	
	if(navigator.userAgent.indexOf('MSIE')>=0){
		var iframe = document.createElement('<IFRAME src="about:blank" frameborder=0>');
		iframe.style.width = optionDiv.style.width;
		iframe.style.height = optionDiv.offsetHeight + 'px';
		iframe.style.display='none';
		iframe.id = 'selectBoxIframe' + selectBoxIds;
		div.appendChild(iframe);
	}
	
	if(dest.getAttribute('selectBoxOptions')){
		var options = dest.getAttribute('selectBoxOptions').split(';');
		var optionsTotalHeight = 0;
		var optionArray = new Array();
		for(var no=0;no<options.length;no++){
			var anOption = document.createElement('DIV');
			anOption.innerHTML = options[no];
			anOption.className='selectBoxAnOption';
			anOption.onclick = selectOptionValue;
			anOption.style.width = optionDiv.style.width.replace('px','') - 2 + 'px'; 
			anOption.onmouseover = highlightSelectBoxOption;
			optionDiv.appendChild(anOption);	
			optionsTotalHeight = optionsTotalHeight + anOption.offsetHeight;
			optionArray.push(anOption);
		}
		if(optionsTotalHeight > optionDiv.offsetHeight){				
			for(var no=0;no<optionArray.length;no++){
				optionArray[no].style.width = optionDiv.style.width.replace('px','') - 22 + 'px'; 	
			}	
		}		
		optionDiv.style.display='none';
		optionDiv.style.visibility='visible';
	}
	
	selectBoxIds = selectBoxIds + 1;
}