function view_cover(id, formid, nurl, divtype, cover)
{
    if(!id) id = "LayLoginForm";
    if(!divtype) divtype = true;
    if(!cover) cover = true;

    if(cover == true) {
        if(!document.getElementById('div_cover')){
            create_cover();
        }else{
            document.getElementById('div_cover').style.width = '100%';

            if(document.body.clientHeight > document.body.scrollHeight) document.getElementById('div_cover').style.height = '100%';
            else document.getElementById('div_cover').style.height = document.body.scrollHeight;
            document.getElementById('div_cover').style.display = 'block';
        }
    }

    var w = parseInt(document.getElementById(id).style.width);
    var h = parseInt(document.getElementById(id).style.height);
    var window_left = (document.body.clientWidth-w)/2;
    var window_top = (document.body.clientHeight-h)/2;
    this.Lw = h/2;

    if(id) {
        this.Lid = id;
        document.getElementById(id).style.display = '';
        document.getElementById(id).style.top = window_top;
        document.getElementById(id).style.left = window_left;
        if(divtype == true) CheckUIElements();
    }

    document.lay_login_form.mb_id.focus();

//  if(formid) document.getElementById('formid').value = formid;
//  if(nurl) document.getElementById('nurl').value = nurl;

    //return true;
}

function CheckUIElements()
{
    var yMenuFrom, yMenuTo, yButtonFrom, yButtonTo, yOffset, timeoutNextCheck;

    yMenuFrom   = parseInt (document.getElementById(this.Lid).style.top, 10);
    if ( window.document.layers )
        yMenuTo = top.pageYOffset + 0;
    else if ( window.document.getElementById )
        yMenuTo = document.body.scrollTop + parseInt('30');

    timeoutNextCheck = 500;

    if ( Math.abs (yButtonFrom - (yMenuTo + 152)) < 6 && yButtonTo < yButtonFrom )
     {
        setTimeout ("CheckUIElements()", timeoutNextCheck);
        return;
    }

    if ( yMenuFrom != yMenuTo )
    {
        yOffset = Math.ceil( Math.abs( yMenuTo - yMenuFrom ) / 10 );
        if ( yMenuTo < yMenuFrom )
            yOffset = -yOffset;

        document.getElementById(this.Lid).style.top = (parseInt(document.getElementById(this.Lid).style.top) + yOffset) + 20;

        timeoutNextCheck = 10;
    }

    setTimeout ("CheckUIElements()", timeoutNextCheck);
}

function cover_off(id){
    if(document.getElementById('div_cover')) document.getElementById('div_cover').style.display = 'none';
    if(id) document.getElementById(id).style.display = 'none';
}

function create_cover(){

    var color = '#FFFFFF';
    var opacity = '80';

    var cover_div = document.createElement('div');
    cover_div.style.position = 'absolute';
    cover_div.style.top = '0px';
    cover_div.style.left = '0px';
    cover_div.style.width = '100%';
    cover_div.style.zIndex = 1;
    if(document.body.offsetHeight > document.body.scrollHeight) cover_div.style.height = '100%';
    else cover_div.style.height = document.body.scrollHeight;
    cover_div.style.backgroundColor = color;
    cover_div.style.filter = 'alpha(opacity='+opacity+')';
    cover_div.id = 'div_cover';
    document.body.appendChild(cover_div);
}