function checkHumanCarcinogenicitySearch(){
	for(i=0;i<=document.getElementById('humanCarcinogenicitySearch').guidelines.length -1;i++)
		if(document.getElementById('humanCarcinogenicitySearch').guidelines[i].checked == true){
			return true;
		}
		alert("Please select at least one Cancer Descriptor by EPA Cancer Guidelines (by Year).");
		return false;
}