//////function window.onhelp(){return false} //屏蔽F1帮助
////document.onkeydown = function(){
//// if(window.event && window.event.keyCode == 113) {
////  window.event.keyCode = 505;
//// }
//// if(window.event && window.event.keyCode == 114) {
////  window.event.keyCode = 505;
//// }
//// if(window.event && window.event.keyCode == 115) {
////  window.event.keyCode = 505;
//// }
//// if(window.event && window.event.keyCode == 116) {
////  window.event.keyCode = 505;
//// }
//// if(window.event && window.event.keyCode == 117) {
////  window.event.keyCode = 505;
//// }
//// if(window.event && window.event.keyCode == 118) {
////  window.event.keyCode = 505;
//// }
//// if(window.event && window.event.keyCode == 119) {
////  window.event.keyCode = 505;
//// }
//// if(window.event && window.event.keyCode == 120) {
////  window.event.keyCode = 505;
//// }
//// if(window.event && window.event.keyCode == 121) {
////  window.event.keyCode = 505;
//// }
//// if(window.event && window.event.keyCode == 122) {
////  window.event.keyCode = 505;
//// }
//// if(window.event && window.event.keyCode == 123) {
////  alert("F12被禁用");
////  event.keyCode=0;
////  event.returnValue=false;
//// }
//// if(window.event && window.event.keyCode == 13) {
////  window.event.keyCode = 505;
//// }
//// /*if(window.event && window.event.keyCode == 8) {
////  alert(str+"\n请使用Del键进行字符的删除操作！");
////  window.event.returnValue=false;
//// }*/
//// if(window.event && window.event.keyCode == 505){
//// 　　alert(str)
////  window.event.returnValue=false;
//// }
////}
////  document.onmousedown=function(oEvent){
////   if(window.event)
////    oEvent=window.event;
////   if(oEvent.button==2)
////    alert("鼠标右键不可用");
//// if(oEvent.button==1)
////    alert("鼠标左键不可用");
////  }