Why the message is not pass to the body of outlook express?

Below is the function of passing the message in a Form to the body of outlook express.

function sendMail()
{
window.location="mailto:"+"?message1="+messageForm.message1.value;
}

Remark:
1)message1 - is the text area name
2)messageForm - is the form name

Please try the following

function sendMail(){

window.location="mailto:"+"?body="+messageForm.message1.value;

}

Thanks for your reply.