if (document.images)
    {
      	preload_image_object = new Image();
      	// set image url
      	image_url = new Array();
      	image_url[0] = "/workspace/gui/nav-full-home-over.gif";
	image_url[1] = "/workspace/gui/nav-full-about-over.gif";
	image_url[2] = "/workspace/gui/nav-full-contact-over.gif";
	image_url[3] = "/workspace/gui/menu-products-title-over.gif";
       	var i = 0;
       	for(i=0; i<=3; i++) 
         	preload_image_object.src = image_url[i];
    }     

var myrules = {	
	'#nav-full li a img' : function(el){
		el.onmouseover = function() {
			this.src = this.src.replace(".png", "-over.gif");
		}
		el.onmouseout = function() {
			this.src = this.src.replace("-over.gif", ".png");
		}
	},
	'.title-link a img' : function(el){
		el.onmouseover = function() {
			this.src = this.src.replace(".gif", "-over.gif");
		}
		el.onmouseout = function() {
			this.src = this.src.replace("-over.gif", ".gif");
		}
	},
	'#banner img.random_banner' : function(el){
	    	var banner=new Array();
     		banner[0]="/workspace/images/banners/ecology.jpg";
     		banner[1]="/workspace/images/banners/ecology2.jpg";
     		banner[2]="/workspace/images/banners/enhancing.jpg";   
     		banner[3]="/workspace/images/banners/fire.jpg";
     		banner[4]="/workspace/images/banners/safety1.jpg";  
   		el.src = banner[Math.floor(Math.random()*banner.length)];
   		//console.log(banner[ran_banner]);
	}
};


Behaviour.register(myrules);