öffne doch einfach wieder ein neues fenster für das vollbild. hier ein beispiel:
<script>
<!--- Hide script from old browsers
// © 2002 M.Bothge - Schwarzheide
// BILD IN NEUEM ZENTRIERTEN FENSTER ÖFFNEN
//
function OpenNewWindow(Picture,Breit,Hoch)
{
xsize = Breit+35;// Zusatz für Rand rechts und links
ysize = Hoch+75; //Zusatz für Rand oben und unten - damit Button angezeit werden kann
ScreenWidth = screen.width;
ScreenHeight = screen.height;
xpos = (ScreenWidth/2)-(xsize/2);
ypos = (ScreenHeight/2)-(ysize/2);
NewWindow=window.open("","Picture","height="+ysize+",width="+xsize+",scrollbars=no,resizable=no,top="+ypos+",left="+xpos+""
;
NewWindow.document.write ("<html><head><title>BILDANZEIGE"
;
NewWindow.document.write ("</title></head>"
;
NewWindow.document.write ("<body bgcolor='#cccccc' onload='focus()'>"
;
//NewWindow.document.write ("<body bgcolor='#cccccc'>"
;
NewWindow.document.write ("<table align='center'><tr>"
;
NewWindow.document.write ("<td align='center' valign='top'>"
;
NewWindow.document.write ("<table border='1' bgcolor='#000000' cellpadding='0' cellspacing='1'><tr><td align='center'>"
;
NewWindow.document.write ("<img src="
;
NewWindow.document.write (Picture);
NewWindow.document.write (">"
;
NewWindow.document.write ("</tr></table>"
;
NewWindow.document.write ("</td></tr><tr>"
;
NewWindow.document.write ("<td align='center' valign='bottom'>"
;
NewWindow.document.write ("<br><center><form><input type='button' value='FENSTER SCHLIESSEN' style='font-family: Verdana; font-size: 10px' onClick='self.close()'>"
;
NewWindow.document.write ("</td></tr></table>"
;
NewWindow.document.write ("</form></body></html>"
;
NewWindow.document.close();
NewWindow.resizeTo(xsize,ysize);
}
// end hiding from old browsers -->
</script>
<div align="center">
<table cellpadding="10" cellspacing="0" border="0">
<tr>
<td align="center" valign="top">
<table border="1" bgcolor="#000000" cellspacing="0" cellpadding="2">
<tr>
<td align="center"><a href="javascript:OpenNewWindow('gfxu/1.gif',224,218)">
<img src="gfxu/1k.gif" alt="Klick mich und ich werde gross..." border="0"></a></td>
</tr>
</table>
<p> </td>
</tr>
</table>
</div>
<p align="center">BILD KLICKEN</p>