var preloaded = [];

		for (var i = 1; i <= 8; i++) {
			preloaded[i] = [loadImage(i + "-1.gif"), loadImage(i + "-1.gif")];		//设置图片的OnMouseOver和OnMouseOut的路径
		}

		function init() {

			if (mtDropDown.isSupported()) {
				mtDropDown.initialize();

//				menu1.onactivate = function() { swapImage("button1", preloaded[1][1].src) };
//				menu1.ondeactivate = function() { swapImage("button1", preloaded[1][0].src) };

//				menu2.onactivate = function() { swapImage("button2", preloaded[2][1].src) };
//				menu2.ondeactivate = function() { swapImage("button2", preloaded[2][0].src) };

//				menu3.onactivate = function() { swapImage("button3", preloaded[3][1].src) };
//				menu3.ondeactivate = function() { swapImage("button3", preloaded[3][0].src) };

//				menu4.onactivate = function() { swapImage("button4", preloaded[4][1].src) };
//				menu4.ondeactivate = function() { swapImage("button4", preloaded[4][0].src) };

//				menu5.onactivate = function() { swapImage("button5", preloaded[5][1].src) };
//				menu5.ondeactivate = function() { swapImage("button5", preloaded[5][0].src) };

//				menu6.onactivate = function() { swapImage("button6", preloaded[6][1].src) };
//				menu6.ondeactivate = function() { swapImage("button6", preloaded[6][0].src) };

//				menu7.onactivate = function() { swapImage("button7", preloaded[7][1].src) };
//				menu7.ondeactivate = function() { swapImage("button7", preloaded[7][0].src) };
				
//				menu8.onactivate = function() { swapImage("button8", preloaded[8][1].src) };
//				menu8.ondeactivate = function() { swapImage("button8", preloaded[8][0].src) };

			}
		}

		function loadImage(sFilename) {
			var img = new Image();
			img.src ="" + sFilename;
			return img;
		}

		function swapImage(imgName, sFilename) {
			document.images[imgName].src = sFilename;
		}

function MM_swapImgRestore() { //v3.0
  var i,x,a=document.MM_sr; for(i=0;a&&i<a.length&&(x=a[i])&&x.oSrc;i++) x.src=x.oSrc;
}

function MM_preloadImages() { //v3.0
  var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
    var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
    if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}

function MM_findObj(n, d) { //v4.0
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
  if(!x && document.getElementById) x=document.getElementById(n); return x;
}

function MM_swapImage() { //v3.0
  var i,j=0,x,a=MM_swapImage.arguments; document.MM_sr=new Array; for(i=0;i<(a.length-2);i+=3)
   if ((x=MM_findObj(a[i]))!=null){document.MM_sr[j++]=x; if(!x.oSrc) x.oSrc=x.src; x.src=a[i+2];}
}