function rolloverOn(){
	document.getElementById("email_subscribe").style.backgroundPosition = "0px -160px";
	if(document.getElementById("email_input").value == "E-mail"){
		document.getElementById("email_input").value = "";	
	}
}

function rolloverOff(){
	document.getElementById("email_subscribe").style.backgroundPosition = "0px -90px";	
	var email = document.getElementById("email_input").value;
	var e = email.replace(/ /i,"");
	if(e == ""){
		document.getElementById('email_input').value = "E-mail";	
	}
}