function Validate() 
{ 
var Email=document.getElementById("emailfrom").value; 
var RegExp = /^(?:\w+\.?)*\w+@(?:\w+\.)+\w+$/; 
if (!RegExp.test(Email)) 
{ 
alert("Please enter a valid e-mail address"); 
document.getElementById("emailfrom").value = "";
document.getElementById("emailfrom").focus();
return false;
} 
else return true
 
}