i=1;

function openAWindow( pageToLoad, winName, width, height, center) {
  xposition=0; yposition=0;
  if ((parseInt(navigator.appVersion) >= 4 ) &&(center)) {
   xposition = (screen.width - width) / 2;
   yposition = (screen.height - height) / 2;
  }
  args = "width=" + width + ","
  + "height=" + height + ","
  + "location=0,"
  + "menubar=0,"
  + "resizable=0,"
  + "scrollbars=0,"
  + "status=0,"
  + "titlebar=0,"
  + "toolbar=0,"
  + "hotkeys=0,"
  + "screenx=" + xposition + "," //NN Only
  + "screeny=" + yposition + "," //NN Only
  + "left=" + xposition + "," //IE Only
  + "top=" + yposition; //IE Only
  window.open( pageToLoad, winName, args );
}

function xget(id) {
	if(document.getElementById) return document.getElementById(id);
	if(document.all) return document.all[id];
	return null;
}

function show(id)
{
	if (xget('relover').src.search(/_a.jpg/i)>0) xget('relover').src='images/img_'+id+'.jpg'; else xget('relover').src='images/img_'+id+'_a.jpg'; 
}