var ns4 = (document.layers) ? true:false;		// Netscape 4.x
var ie = (document.all) ? true:false;			// IE version
var DOM = (document.getElementById) ? true:false;	// DOM supporting versions
var loaded = false;
function init(){	
	if (document.images){		
		images_off  = new Object();
  		images_on   = new Object();
		
		for( var x = 0; x < image_names.length; x++ ) {			
		images_off[image_names[x]] = new Image();
       	images_off[image_names[x]].src = "images/" + image_names[x] + ".gif";
       	images_on[image_names[x]] = new Image();
       	images_on[image_names[x]].src = "images/" + image_names[x] + "_on.gif";
		}			
	}
	loaded = true;			
}		
function rollOn(name,left,right) {
    if (loaded) {
		if (ns4) {
			s = document.images[name]; 
    		s.src = images_on[name].src;
    	}
    	else { document.images[name].src = images_on[name].src; }		
	
		if (left > 0){
				imgTmp= "btn_pipe" + left;		
				document[imgTmp].src="images/btn_pipe_left.gif";	
			}
		if (right > 0){
				imgTmp= "btn_pipe" + right;		
				document[imgTmp].src="images/btn_pipe_right.gif";	
			}		
	}
}
function rollOff(name,left,right) {
    if(loaded) {
    	if(ns4) {
    		s = document.images[name]; 
    		s.src = images_off[name].src;
        }
    	else { document.images[name].src = images_off[name].src; } 		
	    if (left > 0){
				imgTmp= "btn_pipe" + left;		
				document[imgTmp].src="images/btn_pipe.gif";	
			}
		if (right > 0){
				imgTmp= "btn_pipe" + right;		
				document[imgTmp].src="images/btn_pipe.gif";	
			}		
	}	
}

function artWindow(url){
	w=640;
	h=500;
	xLoc = (screen.width/2) - w/2;
	yLoc = (screen.height/2) - h/2 -50;
	url="newsletter/"+url;
	Popup=open(url,'popWindow','toolbar=0,resizable=1,menubar=0,location=0,status=0,scrollbars=1,Width='+w+',Height='+h+',screenX='+xLoc+',screenY='+yLoc+',left='+xLoc+',top='+yLoc)
	Popup.focus();
}