// anchor is the element where the image is inside
// imageurl is the new imageurl for the image
function ChangeThumb(anchor, imageurl) {
	// check imageurl
	if (imageurl=='' || imageurl.indexOf('no_image.jpg')>=0) {
		return false;
	}

	// format imageurl
	if (imageurl.indexOf('_thumb')==-1) {
		// find last slash, insert _thumbs175
		var pos = imageurl.lastIndexOf('/')
		imageurl = imageurl.substr(0,pos+1) + '_thumbs175/' + imageurl.substr(pos+1)
	}
	// Add uploads/
	if (imageurl.indexOf('uploads/')==-1) {
		imageurl = 'uploads' + imageurl
	}
	// run through all contained elements:
	var elements = anchor.getElementsByTagName("img");
	for (var i = 0; i < elements.length; i++) {
	  // reset if error
	  elements[i].width='175';
	  elements[i].height='185';
	  
	  // check image
	  if (elements[i].src.indexOf('no_image.jpg')==-1) {
		  // set image
		  elements[i].src = imageurl;
			break;
		}
	} // for loop
}