jQuery.fn.rolloverSubmit = function(options){		
    
    settings = jQuery.extend( {
        postfix: "_hover"
    }, options);
    
    $filename = new RegExp("^(.*?)\.(gif|jpg|png)", "i");
    $filename_hover = new RegExp("^(.*?)" + settings['postfix'] + "\.(gif|jpg|png)", "i");

	return this.each(function() {	
        jQuery(this).hover(function(){
            $m = $filename.exec(jQuery(this).attr('src'));
            jQuery(this).attr('src', $m[1] + settings['postfix'] + "." + $m[2]);
        }, function(){
            $m = $filename_hover.exec(jQuery(this).attr('src'));
            jQuery(this).attr('src', $m[1] + "." + $m[2]);        
        }); 
	});
};