// limit checkboxes being checked to 3
	function checkCB(cbNamePrefix){
		var selectedCBs = 0;
		var CBs = document.getElementsByName(cbNamePrefix);
		for(var i=0;i<CBs.length;i++){
			if (CBs[i].checked == true){
				selectedCBs++;
			}
		}
		if(selectedCBs >= 3){
			for(var i=0;i<CBs.length;i++){
				if(CBs[i].checked == false){
					CBs[i].disabled = true;
				}
			}
		}else{
			for(var i=0;i<CBs.length;i++){
				if(CBs[i].checked == false){
					CBs[i].disabled = false;
				}
			}
		}
	}

// open an url
// url - the url to open
	function goToUrl(url){
		if(url != null && url.length > 0){
			window.location = url;
		}
	}