function popupWindow(url) {

  window.open(url,'popupWindow','toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=yes,resizable=yes,copyhistory=no,width=700,height=600,screenX=150,screenY=150,top=150,left=150')
}

                function login_validate() {

                        if(document.lform.uname.value=="")
                        {
                                window.alert('Enter your username, please!');
                                document.lform.uname.focus();
                                return false;
                        }

                        if(document.lform.pass.value=="")
                        {
                                window.alert('Enter your password, please!');
                                document.lform.pass.focus();
                                return false;
                        }

                }
                function add_category_validate() {

                        if(document.lform.cat_name.value=="")
                        {
                                window.alert('Enter your category, please!');
                                document.lform.cat_name.focus();
                                return false;
                        }

                }
                function add_subcategory_validate() {

                        if(document.lform.subcat_name.value=="")
                        {
                                window.alert('Enter your subcategory, please!');
                                document.lform.subcat_name.focus();
                                return false;
                        }

                }
                function add_type_validate() {

                        if(document.lform.type_name.value=="")
                        {
                                window.alert('Enter your type name, please!');
                                document.lform.type_name.focus();
                                return false;
                        }

                }