function imgSwitch(url,n, large_url) 
{ 
i = document.getElementById('main_image'); 
i.src = url; 
document.getElementById('main_image_id').value = n; 
document.getElementById('main_image_id_url').href = large_url; 
return false; 
} 

function goPrint(adId,returnUrl) 
{ 
var href = 'print.php?ad_id=' + adId; 
if (document.getElementById('main_image_id')) href += '&image=' + document.getElementById('main_image_id').value; 
if (returnUrl!=null) href+= '&r=' + returnUrl; window.location.href = href; return false; 
}