function onloadEvent(func){
    var one=window.onload
    if(typeof window.onload!='function'){
        window.onload=func
    }
    else{
        window.onload=function(){
            one();
            func();
        }
    }
}

function showtable(){
    var tableid='Ma_Table';        //表格的id
    var overcolor='#F6F6F6';    //鼠标经过颜色
    var color1='#FFFFFF';        //第一种颜色
    var color2='#FFFFFF';        //第二种颜色
    var tablename=document.getElementById(tableid)
    var tr=tablename.getElementsByTagName("tr")
    for(var i=1 ;i<tr.length;i++){
        tr[i].onmouseover=function(){
            this.style.backgroundColor=overcolor;
        }
        tr[i].onmouseout=function(){
            if(this.rowIndex%2==0){
                this.style.backgroundColor=color1;
            }else{
                this.style.backgroundColor=color2;
            }
        }
        if(i%2==0){
            tr[i].className="color1";
        }else{
            tr[i].className="color2";
        }
    }
}
onloadEvent(showtable);