function nav_image()
	{
		if(document.getElementById('swapping_buttons'))
		{
		return document.getElementById('swapping_buttons').getElementsByTagName('img');
		}
	}
	
	function addOnMouseOver()
	{
		// Image PreLoader
		var preLoad = new Array();
		var new_src = new Array();
		
		if(document.getElementById('swapping_buttons'))
		{
			for (var j=0; j < nav_image().length; j++)
			{
					preLoad[j] = new Image();
					preLoad[j].src = nav_image()[j].src.replace(".jpg", "-over.jpg");
			}
			
			
			// loop to add onmouseover function
			for(var a=0; a < nav_image().length; a++)
			{ 
				nav_image()[a].onmouseover = function ()
				{swappicon(this, this.src.replace(".jpg", "-over.jpg"));};
				
				nav_image()[a].onmouseout = function ()
				{swappicon(this, this.src.replace("-over.jpg", ".jpg"));};
			}
		}
	}

	function swappicon(thisimage, imgname) 
	{
		thisimage.src = imgname;
	}