function menuc(n) { 
        
	var menu = document.getElementById("top_menu");
	var links = menu.getElementsByTagName("a");
    var topnav = document.getElementById("navmenu");
	var ulist = topnav.getElementsByTagName("div");

	for(c=0; c<links.length; c++) {
		links[c].onmouseover = function () {
		for(m=0; m<links.length+1; m++) {
			ulist[m].className = 'ul_hidden';
		}
		ulist[this.name].className= 'ul_show';          
		}
//		links[c].onmouseout = function() {
//		for(m=0; m<links.length; m++) {
//			ulist[m].className = 'ul_hidden';
//		}
//		//ulist[0].className= 'ul_show';
//		} 
	}
//	ulist[n].className ='ul_show';
}

function showhome(){
	for(e_i=1;e_i<=5;e_i++){
	$('cat_s_'+e_i).className='ul_hidden';
	}
	$('cat_s_6').className='ul_show';
	}

function w_open(mypage,width,height,top,left){
	window.open (mypage, 'window_'+top+'_'+width, 'width='+width+', height='+height+', top='+top+', left='+left+', toolbar=no, location=no, status=no, menubar=no, scrollbars=yes, resizable=yes');
	}

function copyCode(id){
    var testCode=document.getElementById(id).innerHtml;
    if(copy2Clipboard(testCode)!=false){
        alert("复制成功，你可以使用Ctrl+V 贴到需要的地方去了哦！ ");
    }
}
copy2Clipboard=function(txt){
    if(window.clipboardData){
        window.clipboardData.clearData();
        window.clipboardData.setData("Text",txt);
    }
    else if(navigator.userAgent.indexOf("Opera")!=-1){
        window.location=txt;
    }
    else if(window.netscape){
        try{
            netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");
        }
        catch(e){
            //alert("您的firefox安全限制限制您进行剪贴板操作，请打开'about:config'将 signed.applets.codebase_principal_support'设置为true'之后重试，相对路径为firefox根目录 /greprefs/all.js");
            return false;
        }
        var clip=Components.classes['@mozilla.org/widget/clipboard;1'].createInstance(Components.interfaces.nsIClipboard);
        if(!clip)return;
        var trans=Components.classes['@mozilla.org/widget/transferable;1'].createInstance(Components.interfaces.nsITransferable);
        if(!trans)return;
        trans.addDataFlavor('text/unicode');
        var str=new Object();
        var len=new Object();
        var str=Components.classes["@mozilla.org/supports-string;1"].createInstance(Components.interfaces.nsISupportsString);
        var copytext=txt;str.data=copytext;
        trans.setTransferData("text/unicode",str,copytext.length*2);
        var clipid=Components.interfaces.nsIClipboard;
        if(!clip)return false;
        clip.setData(trans,null,clipid.kGlobalClipboard);
    }
}