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//////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");
//// }