if(document.images){
		
		//top row
		
		_nav_corp_on=new Image();
		_nav_corp_on.src="images/nav_corp_l.gif";
		
		_nav_corp_off=new Image();
		_nav_corp_off.src="images/nav_corp.gif";
		
		_nav_vaca_on=new Image();
		_nav_vaca_on.src="images/nav_vaca_l.gif";
		
		_nav_vaca_off=new Image();
		_nav_vaca_off.src="images/nav_vaca.gif";
		
		_nav_relo_on=new Image();
		_nav_relo_on.src="images/nav_relo_l.gif";
		
		_nav_relo_off=new Image();
		_nav_relo_off.src="images/nav_relo.gif";		

		_nav_conv_on=new Image();
		_nav_conv_on.src="images/nav_conv_l.gif";
		
		_nav_conv_off=new Image();
		_nav_conv_off.src="images/nav_conv.gif";

		
		//side navigation

		_nav_loc_on=new Image();
		_nav_loc_on.src="images/nav_loc_l.gif";
		
		_nav_loc_off=new Image();
		_nav_loc_off.src="images/nav_loc.gif";

		_nav_pack_on=new Image();
		_nav_pack_on.src="images/nav_pack_l.gif";
		
		_nav_pack_off=new Image();
		_nav_pack_off.src="images/nav_pack.gif";

		_nav_app_on=new Image();
		_nav_app_on.src="images/nav_app_l.gif";
		
		_nav_app_off=new Image();
		_nav_app_off.src="images/nav_app.gif";

		_nav_part_on=new Image();
		_nav_part_on.src="images/nav_part_l.gif";
		
		_nav_part_off=new Image();
		_nav_part_off.src="images/nav_part.gif";

		_nav_reg_on=new Image();
		_nav_reg_on.src="images/nav_reg_l.gif";
		
		_nav_reg_off=new Image();
		_nav_reg_off.src="images/nav_reg.gif";

		_nav_off_on=new Image();
		_nav_off_on.src="images/nav_off_l.gif";
		
		_nav_off_off=new Image();
		_nav_off_off.src="images/nav_off.gif";

		_nav_about_on=new Image();
		_nav_about_on.src="images/nav_about_l.gif";
		
		_nav_about_off=new Image();
		_nav_about_off.src="images/nav_about.gif";

		_nav_contact_on=new Image();
		_nav_contact_on.src="images/nav_contact_l.gif";
		
		_nav_contact_off=new Image();
		_nav_contact_off.src="images/nav_contact.gif";

		_nav_home_on=new Image();
		_nav_home_on.src="images/nav_home_l.gif";
		
		_nav_home_off=new Image();
		_nav_home_off.src="images/nav_home.gif";
		
		}
		
		function img_act(imgName) {
		             {
					 if (document.images) { 
		             imgOn = eval(imgName + "on.src");
		             document [imgName].src = imgOn;}
		             }
		     }
		
		function img_inact(imgName) {
		             {
					if (document.images) { 
		             imgOff = eval(imgName + "off.src");
		             document [imgName].src = imgOff;}
		             }
		    }