function show(obj_id) {

    var obj=document.getElementById(obj_id);    

    obj.style.display='block';

}



function hide(obj_id) {

    var obj=document.getElementById(obj_id);    

    obj.style.display='none';

}



function showHide(obj_id) {

    var obj=document.getElementById(obj_id);

    

    if(obj.style.display=='block') {

        hide(obj_id);

    }
    else {

        show(obj_id);

    }
    
    return false;

}

function chBtnTxt(obj_id) {

    var obj=document.getElementById(obj_id);

    

    if(obj.innerHTML=='Wiêcej...') {

        obj.innerHTML='Mniej...'

    }
    else {

        obj.innerHTML='Wiêcej...'

    }
    
    return false;

}



function delConf() {

    return confirm('Are You sure to delete this?');

}



function getBodyWidth() {

    var x = 0;

    if (self.innerHeight) {

        x = self.innerWidth;

    }

    else if (document.documentElement && document.documentElement.clientHeight) {

        x = document.documentElement.clientWidth;

    }

    else if (document.body) {

        x = document.body.clientWidth;

    }

    

    return x;

}

 

function getBodyHeight() {

    var y = 0;

    if (self.innerHeight) {

        y = self.innerHeight;

    }

    else if (document.documentElement && document.documentElement.clientHeight) {

        y = document.documentElement.clientHeight;

    }

    else if (document.body) {

        y = document.body.clientHeight;

    }

    

    return y;

}



function centerSite() {

    var BODY_W=getBodyWidth();

    var SITE_W=920;

    var LEFT_W=(BODY_W-SITE_W)/2;

    

    if(BODY_W<=SITE_W) {

        LEFT_W=0;

    }

    

    document.getElementById('main').style.left=LEFT_W+'px';

}



setInterval('centerSite()', 10);



function wybierzZakladke(zakladka) {

    document.getElementById(zakladka).style.display='block';

    

    for(var klucz in zakladki) {

        var z=zakladki[klucz];

        if(z!==zakladka) {

            document.getElementById(zakladki[klucz]).style.display='none';

        }       

    }

    

    return true;    

}