Newsgroup: it.comp.lang.javascript
Titolo: Rollover con preview immagine

Voglio generare un preview immagine al passaggio del mouse come nel sito 
http://www.templatemonster.com/
Ho scaricato il file js l'ho richiamato con il comando <script ...> e 
sull'immagine di preview ho messo il comando onmouseover etc etc
Nulla ...
Mi date qualche suggerimento per farlo funzionare?
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Tra il tag <head> metto
<script src="/js/preview_templates.js" language="JavaScript" 
type="text/javascript"></script>
All'interno del tag <img> metto
onMouseOver="showtrail('images/flash_images.jpg','Test','477','118');" 
onMouseOut="hidetrail();"
--------------------------------
il file preview_templates.js è il seguente
var offsetfrommouse=[15,25]; //image x,y offsets from cursor position in 
pixels. Enter 0,0 for no offset
var displayduration=0; //duration in seconds image should remain visible. 0 
for always.
var defaultimageheight = 40; // maximum image size.
var defaultimagewidth = 40; // maximum image size.
var timer;
function gettrailobj(){
if (document.getElementById)
return document.getElementById("preview_div").style
}
function gettrailobjnostyle(){
if (document.getElementById)
return document.getElementById("preview_div")
}
function truebody(){
return (!window.opera && document.compatMode && 
document.compatMode!="BackCompat")? document.documentElement : document.body
}
function hidetrail(){
 gettrailobj().display= "none";
 document.onmousemove=""
 gettrailobj().left="-500px"
 clearTimeout(timer);
}
function showtrail(imagename,title,width,height){
 i = imagename
 t = title
 w = width
 h = height
 timer = setTimeout("show('"+i+"',t,w,h);",200);
}
function show(imagename,title,width,height){
    var docwidth=document.all? truebody().scrollLeft+truebody().clientWidth 
: pageXOffset+window.innerWidth - offsetfrommouse[0]
 var docheight=document.all? Math.min(truebody().scrollHeight, 
truebody().clientHeight) : Math.min(window.innerHeight)
 if( (navigator.userAgent.indexOf("Konqueror")==-1  || 
navigator.userAgent.indexOf("Firefox")!=-1 || 
(navigator.userAgent.indexOf("Opera")==-1 && 
navigator.appVersion.indexOf("MSIE")!=-1)) && (docwidth>650 && 
docheight>500)) {
  ( width == 0 ) ? width = defaultimagewidth: '';
  ( height == 0 ) ? height = defaultimageheight: '';
  width+=30
  height+=55
  defaultimageheight = height
  defaultimagewidth = width
  document.onmousemove=followmouse;
  newHTML = '<div class="border_preview" style="width:'+  width 
+'px;height:'+ height +'px"><div id="loader_container"><div id="loader"><div 
align="center">Loading template preview...</div><div id="loader_bg"><div 
id="progress"> </div></div></div></div>';
  newHTML = newHTML + '<h2 class="title_h2">' + ' '+title + '</h2>'
     newHTML = newHTML + '<div class="preview_temp_load"><img 
onload="javascript:remove_loading();" src="' + imagename + '" 
border="0"></div>';
  newHTML = newHTML + '</div>';
  if(navigator.userAgent.indexOf("MSIE")!=-1 && 
navigator.userAgent.indexOf("Opera")==-1 ){
   newHTML = newHTML+'<iframe src="about:blank" scrolling="no" 
frameborder="0" width="'+width+'" height="'+height+'"></iframe>';
  }
  gettrailobjnostyle().innerHTML = newHTML;
  gettrailobj().display="block";
 }
}
function followmouse(e){
 var xcoord=offsetfrommouse[0]
 var ycoord=offsetfrommouse[1]
 var docwidth=document.all? truebody().scrollLeft+truebody().clientWidth : 
pageXOffset+window.innerWidth-15
 var docheight=document.all? Math.min(truebody().scrollHeight, 
truebody().clientHeight) : Math.min(window.innerHeight)
 if (typeof e != "undefined"){
  if (docwidth - e.pageX < defaultimagewidth + 2*offsetfrommouse[0]){
   xcoord = e.pageX - xcoord - defaultimagewidth; // Move to the left side 
of the cursor
  } else {
   xcoord += e.pageX;
  }
  if (docheight - e.pageY < defaultimageheight + 2*offsetfrommouse[1]){
   ycoord += e.pageY - Math.max(0,(2*offsetfrommouse[1] + defaultimageheight 
+ e.pageY - docheight - truebody().scrollTop));
  } else {
   ycoord += e.pageY;
  }
 } else if (typeof window.event != "undefined"){
  if (docwidth - event.clientX < defaultimagewidth + 2*offsetfrommouse[0]){
   xcoord = event.clientX + truebody().scrollLeft - xcoord - 
defaultimagewidth; // Move to the left side of the cursor
  } else {
   xcoord += truebody().scrollLeft+event.clientX
  }
  if (docheight - event.clientY < (defaultimageheight + 
2*offsetfrommouse[1])){
   ycoord += event.clientY + truebody().scrollTop - 
Math.max(0,(2*offsetfrommouse[1] + defaultimageheight + event.clientY - 
docheight));
  } else {
   ycoord += truebody().scrollTop + event.clientY;
  }
 }
 gettrailobj().left=xcoord+"px"
 gettrailobj().top=ycoord+"px"
} 

Allora devi procedere nella seguente maniera:
scaricati il file preview_templates.js e loader.js dopo di che nel tuo
file *.html devi mettere questo:
<html>
	<head>
		<script src="preview_templates.js" language="JavaScript"
type="text/javascript"></script>
		<script src="loader.js" language="JavaScript"
type="text/javascript"></script>
	</head>
	<body>
		<img src="uno.jpg" border=0  border=1 style="border-color: 777777"
onmouseover="showtrail('due.jpg ','Template 12306',430,449);"
onmouseout="hidetrail();">
		<div style="display: none; position: absolute;z-index:110; "
id="preview_div"></div>
	</body>
</html>
spero ti funzioni, io l'ho provato solamente su un motore gecko
(Firefox)
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 ha scritto nel messaggio 
news:1159728066....@h48g2000cwc.googlegroups.com...
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