function prepare_slider(sliderID, leftButton, rightButton){
        var x_pos = 0;
        var li_items_n = 0;	
        var right_clicks = 0;		
        var left_clicks = 0;					
        var li_col = jQuery(sliderID).children("li");		
        var li_width = 194/*li_col.outerWidth(true)*/;		
        var viewWindow = Math.round(jQuery('.box-top').width()/li_width);
        li_col.each(function(index){			
                x_pos += jQuery(this).outerWidth(true);
                li_items_n++;								
        })	

        right_clicks = li_items_n - viewWindow;
        total_clicks = li_items_n - viewWindow;		

        jQuery(sliderID).css('position','relative');
        jQuery(sliderID).css('left','0px');
        jQuery(sliderID).css('width', x_pos+'px');

        var is_playing = false;
        var completed = function() { is_playing = false; }

        jQuery(leftButton).click( function(){													
                cur_offset = jQuery(sliderID).position().left;
                if (!is_playing){						
                        if (left_clicks > 0) {
                                        is_playing = true; jQuery(sliderID).animate({'left': cur_offset + li_width + 'px'}, 700, "linear", completed); 
                                        right_clicks++; 
                                        left_clicks--;
                                } 
                                else {
                                        is_playing = true;
                                        jQuery(sliderID).animate({'left':    -li_width*total_clicks	+ 'px'}, 700, "linear", completed); 
                                        right_clicks = 0;
                                        left_clicks = total_clicks;
                                }
                }
        });		

        jQuery(rightButton).click( function(){
                if (!is_playing){			
                        cur_offset = jQuery(sliderID).position().left;			
                        if (right_clicks > 0) {
                                        is_playing = true; 
                                        jQuery(sliderID).animate({'left': cur_offset - li_width + 'px'},700, "linear", completed );
                                        right_clicks--; left_clicks++; 
                        } 
                        else { 
                                        is_playing = true; jQuery(sliderID).animate({'left':    0	+ 'px'},700, "linear", completed ); 
                                        left_clicks = 0;
                                        right_clicks = total_clicks;
                                }			 
                }
        });	

}

jQuery.fn.over = function(){
    jQuery(this).hover(
        function () {
             jQuery(this).addClass("over");
        },
        function () {
             jQuery(this).removeClass("over");
        }
    );		
}
   
jQuery.fn.intro2 = function(){
    var slider_link = jQuery('#tab1 .slider .box-right');
    var slider_right_link_index = 5;
    var slider_count = jQuery('#slider_list > li').size();

    function slider_intro(){													
        if(slider_right_link_index <= slider_count){
            slider_link.trigger('click');
            slider_right_link_index++;
            setTimeout(function(){slider_intro()}, 7000); //select change time
        }				
    }		
    setTimeout(function(){slider_intro()}, 7000)
}