function IsDigitnum(){return ((event.keyCode >= 48) && (event.keyCode <= 57));}
function IsDigittel(){return (((event.keyCode >= 48) && (event.keyCode <= 57))|| (event.keyCode == 45));}
function isdateandtime(){return (((event.keyCode >= 48) && (event.keyCode <= 58)) || event.keyCode==32 || event.keyCode==45);}
function Isletter(){return ((event.keyCode >= 97) && (event.keyCode <= 122));}
function Isletterandnum(){return (((event.keyCode >= 97) && (event.keyCode <= 122)) || ((event.keyCode >= 48) && (event.keyCode <= 57)));}

function confirmdelclass(){if(confirm("该操作将对选定栏目、其子栏目及相关栏目内容进行删除，您确定要进行该操作吗？"))return true;else {return false;}}
function confirmdelcon(){if(confirm("该操作将删除选定内容，您确定要进行该操作吗？"))return true;else {return false;}}
function CheckAll(form) {for (var i=0;i<form.elements.length;i++) {var e = form.elements[i];if (e.name != 'chkall')e.checked = form.chkall.checked;}}