function checkForm() {
	var valid = "0123456789";
		
	field = document.getElementById("ctl00_PlaceHolderMain_zipcode").value;
	distance = document.getElementById("ctl00_PlaceHolderMain_distance").value;;
	


	if (field.length!=5) {
		alert("Please enter a valid 5 digit zip code");
		return false;
	}

	for (var i=0; i < field.length; i++) {
		temp = "" + field.substring(i, i+1);
			
		if (valid.indexOf(temp) == "-1") {
		alert("Please enter a valid 5 digit zip code");
		return false;
		}

	}
	if (distance >0 && distance < 101) {
	return true;
	} else {
		alert("Please enter a distance less or equal to 100 miles");
		return false;
	}
	
}