function leftClick() {
    
function rightClick() {
    
<MAP NAME="productMap">
<AREA NAME="leftHalf" COORDS="0,0,250,400" 
HREF="javascript:leftClick()"
onMouseOver="self.status='Left side of the image; return true"
onMouseOut="self.status=''; return true">
<AREA NAME="rightHalf" COORDS="0,0,600,600"
HREF="javascript:rightClick()"
onMouseOver="self.status='Right side of the image; return true"
onMouseOut="self.status=''; return true">
</MAP>
<IMG NAME="currentImage"
SRC="productImage.gif" ALIGN="TOP" ALT="[Product catalogue]"
USEMAP="#productMap">