function  Form_Validator(frm) 
{
    if(frm.username.value=="")
    {
		alert("Please enter username!");
		return false;
    }
    if(frm.passwd.value=="") 
    {
		alert("Please enter password!");
		return false; 
    }
    if(frm.verifycode){
	    if(frm.verifycode.value=="")
	    {
			alert("Please enter verify code!");
			return false;
	    }
    }
}