<!-- Initialize page for js visitors -->
function init_page(){
var searchfield = $('services_zipcode');
var searchlabel = $('services_label');
searchlabel.style.display = "none";
	if (searchfield.value == "Enter Your Zip Code") {
	$('services_zipcode').value = "";
	$('services_zipcode').style.color = "#cccccc";
	}
search_message();
}

<!-- Set hide/show on search label -->

function search_message() {
var searchfield = $('services_zipcode');
var searchlabel = $('services_label');
	if (searchfield.value == "Enter Your Zip Code") {
	searchfield.value = "";
	searchfield.style.color = "#000000";
	} else if (searchfield.value == "") {
	searchfield.value = "Enter Your Zip Code";
	searchfield.style.color = "#cccccc";
	}
}

<!-- OnLoad Event -->
Event.observe(window, "load", init_page);