current_overID = "";
last_overID = "";

function item (img_name,width,height)
{
        img_prefix = img_name;
        this.slide_img = new Image (width,height);
        this.slide_img.src = "../images/" + img_prefix + ".gif";
}

function new_item (img_name,width,height) 
{
        item [img_name] = new item (img_name,width,height);
}

function mouseover (itemID)
{
        current_overID = itemID;
        if (current_overID != last_overID) {
                          document.jrcmap.src = item [current_overID].slide_img.src;
        }
}
new_item ("amb-map",500,285);
new_item ("america-map",500,285);
new_item ("europe-map",500,285);
new_item ("asia-map",500,285);