function verifyCompatibleBrowser() { 
    this.ver = navigator.appVersion; 
    this.dom = document.getElementById?1:0 
    this.ie5 = (this.ver.indexOf("MSIE 5")>-1 && this.dom)?1:0; 
    this.ie4 = (document.all && !this.dom)?1:0; 
    this.ns5 = (this.dom && parseInt(this.ver) >=  5) ?1:0;  
    this.ns4 = (document.layers && !this.dom)?1:0; 
    this.bw = (this.ie5 || this.ie4 || this.ns4 || this.ns5); 
    return this; 
} 
 
function ConstructObject(obj, nest) { 
    nest = (!nest) ? '':'document.'+nest+'.'; 
    this.el = bw.dom?document.getElementById(obj):bw.ie4?document.all[obj]:bw.ns4?eval(nest+'document.'+obj):0; 
    this.css = bw.dom?document.getElementById(obj).style:bw.ie4?document.all[obj].style:bw.ns4?eval(nest+'document.'+obj):0; 
    this.scrollHeight = bw.ns4?this.css.document.height:this.el.offsetHeight; 
    this.clipHeight = bw.ns4?this.css.clip.height:this.el.offsetHeight; 
    this.up = MoveAreaUp;
    this.down = MoveAreaDown; 
    this.MoveArea = MoveArea; 
    this.x; 
    this.y; 
    this.obj = obj + "Object"; 
    eval(this.obj + " = this"); 
    return this; 
} 

function MoveArea(x, y) { 
    this.x = x;
    this.y = y; 
    this.css.left = this.x+'px'; 
    this.css.top = this.y+'px'; 
} 
 
function MoveAreaDown(move) { 
	if (this.y>-this.scrollHeight+objContainer.clipHeight) { 
        this.MoveArea(0,this.y-move);
        if (loop) setTimeout(this.obj+".down("+move+")",speed); 
	} 
} 

function MoveAreaUp(move) { 
	if (this.y<0) { 
        this.MoveArea(0,this.y-move); 
        if (loop) setTimeout(this.obj+".up("+move+")",speed); 
	} 
} 
 
function PerformScroll(speed) { 
	if (initialised) { 
		loop = true; 
		if (speed>0) 
		    objScroller.down(speed); 
		else 
		    objScroller.up(speed); 
	} 
} 
 
function CeaseScroll() { 
    loop = false; 
    if (timer)
        clearTimeout(timer); 
} 

function InitialiseScrollableArea(nav, start_x, start_y) { 
	if(!start_x)
		start_x = 0;
	if(!start_y)
		start_y = 0;
	if(nav == 'divContent')
	{
	    objContainer = new ConstructObject('divContainer'); 
	    objScroller = new ConstructObject('divContent','divContainer'); 
	}
	else if(nav == 'divContent_nosection_nav')
	{
		objContainer = new ConstructObject('divContainer_nosection_nav'); 
	    objScroller = new ConstructObject('divContent_nosection_nav','divContainer_nosection_nav');
	}
    objScroller.MoveArea(start_x,start_y); 
    objContainer.css.visibility = 'visible'; 
    initialised = true; 
} 

var bw = new verifyCompatibleBrowser();  
var speed = 100; 
var initialised;  
var loop;
var timer;