var imgArray=["images/01.gif","images/02.gif","images/03.gif","images/04.gif","images/05.gif","images/06.gif"]; 
var orderArray=[]; 
while(imgArray.length>0){ 
    var n=parseInt(Math.random()*imgArray.length); 
    orderArray.push(imgArray[n]); 
    imgArray.splice(n,1); 
} 
window.onload=function(){ 
    window.theImgNumber=0;//全局变量 
    var theImg=document.getElementById("theImg"); 
    theImg.src=orderArray[theImgNumber]; 
    theImg.onmouseout=function(){ 
        theImgNumber++; 
        this.src=orderArray[theImgNumber%6]; 
    } 
}