function Over(IMG){
baseIMG = document.images[IMG].src;
newIMG = baseIMG.replace(baseIMG.substr(baseIMG.length-4,4),("_o" + baseIMG.substr(baseIMG.length-4,4)));
document.images[IMG].src=newIMG;
}

function Out(IMG){
baseIMG = document.images[IMG].src;
newIMG = baseIMG.replace(baseIMG.substr(baseIMG.length-6,6),baseIMG.substr(baseIMG.length-4,4));
document.images[IMG].src=newIMG;
}

function Init(){
prImg= new Array();
for (i=0; i<document.images.length; i++){
if(document.images[i].name){
baseIMG = document.images[i].src;
newIMG = baseIMG.replace(baseIMG.substr(baseIMG.length-4,4),("_o" + baseIMG.substr(baseIMG.length-4,4)));
prImg[i] = new Image();
prImg[i].src = newIMG;
}
}
}