//Verificacion correo
function cmail(){
	if (document.getElementById("umail").value == "" || document.getElementById("umail").value.indexOf('@') == -1 || document.getElementById("umail").value.indexOf('.')== -1){
    	alert("Su direcci\u00f3n de correo electr\u00f3nico no es v\u00e1lida.");
		document.getElementById("umail").focus(); 
		return false;
	}
}

//Solo numeros
function isNumberKey(evt){
	var charCode = (evt.which) ? evt.which : event.keyCode
	if (charCode > 31 && (charCode < 48 || charCode > 57)){
		return false;
	} else {return true;}
}