var menu = new Array;
menu[0] = "menu0";
menu[1] = "menu1";
menu[2] = "menu2";
menu[3] = "menu3";
menu[4] = "menu4";
menu[5] = "menu5";
menu[6] = "menu6";
menu[7] = "menu7";

function showMenu(n){
	var obj = eval(menu[n]);
	var strPic2;
	                    var tdcolor;
	  // alert(n);                
	                    strPic1='url(images/topbj.gif)';
	                    strPic2='url()';
	 for(var i=0;i<=4;i++){
	//  alert('menu_'+i);
		                    if (i==n){			
			                    getObject('menu_'+i).style.background=strPic1;
			                 
			                    }
		                    else {
			                    getObject('menu_'+i).style.background=strPic2;
			                 
			                    }
			                    }
	if(obj.style.visibility=="visible") return;

	obj.style.visibility="visible";

	for (i=0;i<4;i++){
		mObj = eval(menu[i]);
		if (i!=n) mObj.style.visibility="hidden";
		
}
//在此写入弹出菜单的隐藏情况
 //getObject('menu4').style.visibility="hidden";
  //getObject('menu2').style.visibility="hidden";
   getObject('menu5').style.visibility="hidden";
}

function hideMenu(n) {
	var obj = eval(menu[n]);
	obj.style.visibility="hidden";

}
function getObject(objectId) {
    if(document.getElementById && document.getElementById(objectId)) {
	// W3C DOM
	return document.getElementById(objectId);
    } else if (document.all && document.all(objectId)) {
	// MSIE 4 DOM
	return document.all(objectId);
    } else if (document.layers && document.layers[objectId]) {
	// NN 4 DOM
	return document.layers[objectId];
    } else {
	return false;
    }
} // getObject