// JavaScript Document
function check(f){
	        theform=document.f
			
			//Checamos si el usuario introduce su codigo
			if(theform.zipcode.value==""){
			alert("Please provide a valid United States Zip Code")
			theform.zipcode.focus()
			return false;
			}
			if(theform.email.value==""){
			alert("Please provide a valid email address")
			theform.email.focus()
			return false;
			}
			
			theform.submit();
			}