isDOM=document.getElementById //DOM1 browser (MSIE 5+, Netscape 6, Opera 5+)
isMSIE=document.all && document.all.item //Microsoft Internet Explorer 4+
isNetscape4=document.layers //Netscape 4.*
isOpera=window.opera //Opera
isOpera5=isOpera && isDOM //Opera 5+
isMSIE5=isDOM && isMSIE && !isOpera //MSIE 5+
isMozilla=isNetscape6=isDOM && !isMSIE && !isOpera


function getLayer(layerName, parentLayerName){
  if(isDOM){ return document.getElementById(layerName); }
  if(isMSIE){ return document.all[layerName]; }
  if(isNetscape4){ return eval('document.layers[layerName]'); }
  return false;
}

function ts(e,what,offset){
  mousex = e.clientX;
  mousey = e.clientY;
  pagexoff = 0;
  pageyoff = 0;
  if(isMSIE5){
    pagexoff = document.body.scrollLeft;
    pageyoff = document.body.scrollTop;
  }
  else{
    pagexoff = window.pageXOffset;
     pageyoff = window.pageYOffset;
  }
  if(getLayer(what)){
    if(isNetscape4)
      obj = getLayer(what);
    else
      obj = getLayer(what).style;
 	
  	if(obj){
	    leftoff = mousex-pagexoff;
    	obj.left = (mousex+pagexoff) - offset;
  /*  sdec' */
    	
	    topoff = mousey-pageyoff;
    	if(isOpera && topoff <= 30)
    	  obj.top = mousey + 20;
	    else 
		if( mousey <= 30) 
	        obj.top = (mousey+pageyoff) + 20;
		else 
	      if (isOpera) 
    	    obj.top = mousey + 20;
	    else
    	  obj.top = (mousey+pageyoff) + 20;
   		
		
	    if(isNetscape4)
    	  obj.visibility = 'show';
	    else
    	  obj.visibility = 'visible';
	  }
   }
  return true;
}

function tc(){
  if(obj){
    if(isNetscape4)
      obj.visibility = 'hide';
    else
      obj.visibility='hidden';
  }
  return true
}



function openCenteredWindow(url, height, width, name, parms) {
   var left = Math.floor( (screen.width - width) / 2);
   var top = Math.floor( ((screen.height-35) - height) / 2);
   if (top < 0) top = 0
   var winParms = "top=" + top + ",left=" + left + ",height=" + height + ",width=" + width;
   if (parms) { winParms += "," + parms; }
   var win = window.open(url, name, winParms);
   if (parseInt(navigator.appVersion) >= 4) { win.window.focus(); }
   return win;
}


function viewImage(width,height,file)
{	
	var sWidth, sHeight;
	var aWidth	= screen.width - 8;
	var aHeight	= screen.height - 50;	
	var scroll	= 'yes';
	
	// if the width or height exceeds the users screen dimensions alter it
	sWidth	= width;
	sHeight	= height;
	
	if(aWidth < width){
		sWidth	= aWidth;
		scroll	= 'yes';
	}
	
	if(aHeight < height){
		sHeight	= aHeight;
		scroll	= 'yes';
	}	
	
	openCenteredWindow(file,sHeight+50,sWidth+8,'imageView','scrollbars='+scroll);
	return;
}