function overIcon(i){
document.images[i].src = document.images[i].src.substring(0,document.images[i].src.length-5)+"b.gif";
}

function outIcon(i){
//document.images[i].src = document.images[i].src.substring(0,document.images[i].src.length-5)+"a.gif";
var i = 1;
while(i<=4){
document.images['icon_'+i].src = document.images['icon_'+i].src.substring(0,document.images['icon_'+i].src.length-5)+"a.gif";
i++;
}
}

function outIcon2(i){
document.images[i].src = document.images[i].src.substring(0,document.images[i].src.length-5)+"a.gif";
}

function chengeIcon(){
//var i = 1;
//while(i<=4){
//document.images['icon_'+i].src = document.images['icon_'+i].src.substring(0,document.images['icon_'+i].src.length-5)+"a.gif";
//i++;
//}
}