call following function on
onclientclick of button
function sendMail()
{
var link = "mailto:me@example.com"+
"?cc=CCaddress@example.com"+
"&subject=" + escape("This is subject")+
"&body=" + escape("This is body");
window.location.href = link;
}
escape function:
This function makes a string portable, so it can be transmitted across any network to any computer that supports ASCII characters.