function clean (user_value, default_value) {

	if(user_value == default_value) 	return ''; 
	else if(user_value == '')		return default_value;
	else					return user_value;
}

function preloadImages() {

	var d=document; 
	if(d.images)
	  {
		if(!d.p) 
		  d.p=new Array();
		
  		var i;
		var j=d.p.length;
		var a=preloadImages.arguments; 
		
		for(i=0; i<a.length; i++)
  		if(a[i].indexOf("#")!=0)
		  {
			d.p[j]=new Image; 
			d.p[j++].src="images/main_layout/"+a[i];
		  }
	  }
}

function preload_images_now () {
preloadImages('menu_bt_home_hover.gif',
			  'menu_bt_home_active.gif',
			  'menu_bt_whats_new_hover.gif',
			  'menu_bt_whats_new_active.gif',
			  'menu_bt_special_events_hover.gif',
			  'menu_bt_special_events_active.gif',
			  'menu_bt_promo_coupons_hover.gif',
			  'menu_bt_promo_coupons_active.gif',
			  'menu_bt_photo_gallery_hover.gif',
			  'menu_bt_photo_gallery_active.gif',
			  'menu_bt_about_us_hover.gif',
			  'menu_bt_about_us_active.gif');
}