function sv() {
	document.title += "!";
	var z = document.getElementById('zip');
	var oval = z.getAttribute('ovalue');
	if(z.value == oval) {
		z.value = '';
	} else {
		z.value = oval;
	}
}

function init() {
	var z = document.getElementById('zip');
	var ovalue = z.value;
	z.onfocus = function() {
		if(z.value==ovalue){
			z.value='';
		}
	}
	z.onblur = function() {
		if(z.value==''){
			z.value=ovalue;
		}
	}
}

if(window.addEventListener) {
	window.addEventListener('load', init, false);
} else if(window.attachEvent) {
	window.attachEvent('onload', init);
} else {
	window.onload = init;
}