function validator(){
var zip=document.formZip.zipTxt;

if(zip.value!="" && !isNaN(zip.value) && zip.value.length==5){

	var form_url="http://www.topfertilityspecialists.com/zip/"+zip.value+"/50.html";
	//window.location="http://www.topfertilityspecialists.com/zip/"+zip.value+"/50.html";
	$("form#formZip").attr({action:form_url});
	$("form#formZip").submit();
	return false;
	}else{
		alert("Please insert a valid Zip Code");
		zip.focus();
		zip.value="";
		return false;
		}
}