function getScrollY() {
  var scrOfX = 0, scrOfY = 0;
  if( typeof( window.pageYOffset ) == 'number' ) {
    //Netscape compliant
    scrOfY = window.pageYOffset;
    scrOfX = window.pageXOffset;
  } else if( document.body && ( document.body.scrollLeft || document.body.scrollTop ) ) {
    //DOM compliant
    scrOfY = document.body.scrollTop;
    scrOfX = document.body.scrollLeft;
  } else if( document.documentElement && ( document.documentElement.scrollLeft || document.documentElement.scrollTop ) ) {
    //IE6 standards compliant mode
    scrOfY = document.documentElement.scrollTop;
    scrOfX = document.documentElement.scrollLeft;
  }
  //return [ scrOfX, scrOfY ];
  return scrOfY;
}


function showCoords(evt,id,img){
  if (id<10000) id = "0"+id;
  document.getElementById("provaIMG").src = img;
 document.getElementById("code").innerHTML = id;
 document.getElementById("prova").style.visibility = "visible";
  
 if(navigator.appName.indexOf("Netscape")>-1) { 
	document.getElementById("prova").style.top = evt.layerY+"px";
	document.getElementById("prova").style.left = evt.layerX+"px";
 } 
 else
 {
	document.getElementById("prova").style.top = (getScrollY()+evt.clientY)+"px";
	document.getElementById("prova").style.left = evt.clientX+"px";
 }
 
 }
 function hideDiv()
 {
 document.getElementById("prova").style.visibility = "hidden";
 document.getElementById("provaIMG").src = "loader_foto.gif";
 }