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 = img_prefix + ".jpg";
}

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 ("cars",787,154);
new_item ("cars1",787,154);
new_item ("cars2",787,154);
new_item ("cars3",787,154);
new_item ("cars4",787,154);