function MM_preloadImages() { //v3.0
  		var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
    	var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
    	if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
	}
	
	function swapImage(img){
			
		var file_path = img.src.substring(0,img.src.lastIndexOf('/')+1);
		var file_name = img.src.substring(img.src.lastIndexOf('/')+1,img.src.lastIndexOf('.'));
		var file_extension = img.src.substring(img.src.lastIndexOf('.'), img.src.length);
		
		var lastChars = file_name.substring(file_name.length-3, file_name.length);
		
		if (lastChars == '_ro'){
			file_name = file_name.substring(0, file_name.lastIndexOf('_ro'));
		}else{
			file_name = file_name + "_ro";
		}
		
		img.src = file_path + file_name + file_extension;
					
	}