function switchImage(iURL,iW,iH,bURL,bW,bH)
{
 document.getElementById('main_image_holder').innerHTML = "<img src=" + iURL +
							  " width="+ iW +
							  " height="+ iH + ">";
 document.getElementById('imgLinkMain').href = "javascript:showEnlargedImage('" + bURL + "','" + bW + "','" + bH + "');";
}


function showEnlargedImage(iURL,iW,iH)
{
 // adjust left margin based on iW
 var mLeft = 214 - (iW/2);

 var dObj = document.getElementById('div_image_enlarged');
 dObj.style.marginLeft = mLeft + "px";

 dObj.innerHTML = "<table border=0 cellpadding=0 cellspacing=0>" +
                  "<tr><td class=fp_img_c1><br></td><td class=fp_img_top><br></td><td class=fp_img_c2><br></td></tr>" +
                  "<tr><td class=fp_img_left><br></td><td class=fp_img_center>" +
                  "<A href=javascript:hideEnlargedImage();><img src=" + iURL + " height=" + iH + " width=" + iW + "></a>" +
                  "<A href=javascript:hideEnlargedImage();>click to close</a>" +
                  "</td><td class=fp_img_right><br></td></tr>" +
                  "<tr><td class=fp_img_c3><br></td><td class=fp_img_bot><br></td><td class=fp_img_c4><br></td></tr>" +
                  "</a></td></tr></table>";
}

function hideEnlargedImage()
{
 document.getElementById('div_image_enlarged').innerHTML = '';
}