function switchmenu(obj,objimg){
        if(document.getElementById){
        var el = document.getElementById(obj);
		var cl = document.getElementById(objimg);
        var ar = document.getElementById("maindiv").getElementsByTagName("div"); 
		var ir = document.getElementById("maindiv").getElementsByTagName("td");
                if(el.style.display != "block"){
                        for (var i=0; i<ar.length; i++){
                                if (ar[i].className=="submenu") 
                                ar[i].style.display = "none";
                        }
						if(obj == 'sub9'){
						if(ar[8].style.display != "none"){document.getElementById('sub10').style.display = "none";}
						else{document.getElementById('sub10').style.display = "";}
						}
                        for (var i=0; i<ir.length; i++){
                                if (ir[i].className=="menutitle") 
                                ir[i].innerHTML='<img src="http://images.91.com/eo91e/index/edition3/add.gif" width="9" height="8">'
                        }
                        el.style.display = "block";
						cl.innerHTML='<img src="http://images.91.com/eo91e/index/edition3/jian.gif" width="9" height="8">'
                }else{
                        el.style.display = "none";
						cl.innerHTML='<img src="http://images.91.com/eo91e/index/edition3/add.gif" width="9" height="8">'
						if(obj == 'sub9'){
						if(ar[8].style.display != "none"){document.getElementById('sub10').style.display = "none";}
						else{document.getElementById('sub10').style.display = "";}
						}
                }
        }
}