function check_user(uname) {
	if(uname.length < 3)
		{
		document.getElementById('ch_name').innerHTML = '<div style="border: 1px solid #ff0000; font-family: tahoma; font-size: 8pt; font-weight:normal;color: #fff; background-color: #ff0000;text-align: center; height: 19px">يجب زيادة عدد الخانات</div>';	
		}else{
		document.getElementById('ch_name').innerHTML = '<iframe name="I1" marginwidth="1" marginheight="1" height="28" width="100" scrolling="no" border="0" frameborder="0" src="includes/check_user.php?username='+uname+'">Your browser does not support inline frames or is currently configured not to display inline frames.</iframe>';	
		}
}