function getFileExtension(filename)
{
    var ext = /(^.+)\.([^.]+)$/.exec(filename);
    return ext;
}


var prepare_slider = function(){

    var x_pos = 0;
    var li_items_n = 0;
    var right_clicks = 0;
    var viewWindow = 5;
    var left_clicks = 0;

    var li_col = $("#slider_list li");

    li_col.each(function(index){
        //size = li.getSize();
        x_pos += $(this).width();

        li_items_n++;

        $(this, "img").css('cursor','pointer');



    })


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


    var is_playing = false;

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

    $('#left_but').click( function(){


        cur_offset = $('#slider_list').position().left;




        if (!is_playing)									 {

            if (left_clicks > 0) {is_playing = true; $('#slider_list').animate({'left': cur_offset + 210 + 'px'}, 400, "linear", completed); right_clicks++; left_clicks--;} else {is_playing = true; $('#slider_list').animate({'left':    -210*total_clicks	+ 'px'}, 400, "linear", completed); right_clicks = 0; left_clicks = total_clicks;}
        }
    });

    $('#right_but').click( function(){

        if (!is_playing)									 {

            cur_offset = $('#slider_list').position().left;

            if (right_clicks > 0) {is_playing = true; $('#slider_list').animate({'left': cur_offset - 210 + 'px'},400, "linear", completed ); right_clicks--; left_clicks++; } else { is_playing = true; $('#slider_list').animate({'left':    0	+ 'px'},400, "linear", completed ); left_clicks = 0; right_clicks = total_clicks;}

        }
    });

}