if (window!= top)

top.location.href=location.href;

function check_blank(form)
{
okay=0;

if (form.ID.value=="")
{
alert("You must enter your Username!");
return false;
}
if (form.Pwd.value=="" && okay==0)
{
alert("You must enter Your Password!");
return false;
}

if (okay==0)
{
return true;
}

}