// display's popup area
function display_popup(mask_id, id) {
    var maskHeight = $(document).height();
    var maskWidth = $(window).width();

    //Set heigth and width to mask to fill up the whole screen  
    $(mask_id).css({'width':maskWidth,'height':maskHeight});

    //transition effect       
    $(mask_id).fadeIn(1000);
    $(mask_id).fadeTo("slow",0.8);

    var winH = $(window).height();
    var winW = $(window).width();

    //Set the popup window to center  
    $(id).css('top',  winH/2-$(id).height()/2);
    $(id).css('left', winW/2-$(id).width()/2);

    //transition effect  
    $(id).fadeIn(1000);

}

// show's helptext
function showHelptext(fid) {
    display_popup('#helpmask', '#helptext_area');
    var text = $("#"+fid+"_helptext").html();
    $('#helptext_area').html(text);
}

function _close_helpmask() {
    $('#helptext_area').hide();
    $('#helpmask').hide();
}

// shows subjects logos management
function showSubjLM() {
    display_popup('#subjlmask', '#logosmanagement_area');
}

function _close_subjlm() {
    $('#logosmanagement_area').hide();
    $('#subjlmask').hide();
}

function extendSearchOptions() {
    $('.showmore').remove();
    $('#searchcoll').slideDown(500);
    refre.myinit();
}