var mail = false;
var mdp = false;
$(document).ready(function() { 
	
	$("#mail").focus(function () {
	         if(!mail){
				this.value = "";
				mail = true;
			}
	});

	$("#mdp").focus(function () {
	         if(!mdp){
				this.value = "";
				mdp = true;
			}
	});
});