function valid_email(id)
{
	var s = document.getElementById(id).value;
	var filter=/^[A-Za-z0-9_.][A-Za-z0-9_.]*@[A-Za-z0-9_]+\.[A-Za-z0-9_.]+[A-za-z]$/;
	if (s.length == 0 ) { 
		return false
	}else{
		if (filter.test(s)) {
	   		return true
	  	}else{
	   		return false
	 	}
	}
}
	
function val(form)
{	
	if( document.getElementById("Nombre").value != "" && valid_email("E-Mail") && form.Consulta.value != "" )
	{
		document.getElementById("Submit").disabled="";
	}
	else
	{
		document.getElementById("Submit").disabled="disabled";
	}
}