var mainimg;
function change_main(img){
	mainimg = img;
	document.mainimage.src='http://www.interarch.bg/uploads/images/s2/' + img;
}
function open_s3(defaultimg){
	var file ;
	if(mainimg) file = "http://www.interarch.bg/s3.php?img=" + mainimg ;
	else  file = "http://www.interarch.bg/s3.php?img=" + defaultimg ;
	menuWindow = window.open(file,'mhm','left=30,top=0,location=no,menubar=no,toolbar=no,resizable=no,scrollbars=yes');
}