function chkFormular()
{
if(document.form1.email.value == "")
{
alert("Please your indicate its e-mail address!");
document.form1.email.focus();
return false;
}
if(document.form1.email.value.indexOf('@') == -1)
{
alert("No valid e-mail address!");
document.form1.email.focus();
return false;
}
if(document.form1.email.value.indexOf('.') == -1)
{
alert("No valid e-mail address!");
document.form1.email.focus();
return false;
}
if(document.form1.name.value == "")
{
alert("Register please your name!");
document.form1.name.focus();
return false;
}

{
 document.form1.elements["send"].value="sent";
 document.form1.elements["send"].disabled="disabled";
 return true;
}
}