function validate() {

if (document.getElementById("sender").value.length < 2 )	{
    alert("Please provide a real name");
    return false;
    }

if (document.forms[0].sender_mail.value.indexOf('@')==-1  || document.forms[0].sender_mail.value.indexOf('.')==-1  || document.forms[0].sender_mail.value.length <= 7 ) 
    {
    alert("Please provide your email");
    return false;
    }

if (document.forms[0].dest_mail.value.indexOf('@')==-1  || document.forms[0].dest_mail.value.indexOf('.')==-1  || document.forms[0].dest_mail.value.length <= 7 ) 
    {
    alert("Please provide friend email");
    return false;
    }

if (document.getElementById("msg").value.length < 5 )	{
    alert("Please write a message ");
    return false;
    }

}