img1 = new Image;

for ( i = 0 ; i == 3 ; i++ ){
    img1.src = "App_Themes/he-IL/home/btPro0" + i + "_over.jpg";
}


function HandleOver (ID) {
    document.getElementById(ID).src = "App_Themes/he-IL/home/" + ID + "_over.jpg";
}
function HandleOut (ID) {
   document.getElementById(ID).src = "App_Themes/he-IL/home/" + ID + ".jpg";
}