jQuery.fn.prepare_slider = function(){  
        var x_pos = 100;
        var li_items_n = 0; 
        var right_clicks = 0;       
        var left_clicks = 0;                    
        var li_col = jQuery("#slider_list .coll");      
        var li_width = li_col.outerWidth(true);     
        var viewWindow = 4;
        
        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('#slider_list').css('position','relative');
        jQuery('#slider_list').css('left','0px');
        jQuery('#slider_list').css('width', x_pos+'px');
        
        var is_playing = false;
        var completed = function() { is_playing = false; }

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

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

jQuery.fn.over = function(){    
        jQuery(this).each(function(i){
            jQuery(this).bind("mouseover", function(){
                    jQuery(this).addClass("over");
                })
            jQuery(this).bind("mouseout", function(){
                    jQuery(this).removeClass("over");
                })
        });     
   }