var PopUpX = (screen.width/2)-150;
var PopUpY = (screen.height/2)-200;
var pos = ",left="+PopUpX+",top="+PopUpY;

function otevri(URL,name,w,h) {
w = w+20;
h = h+20;
features = "scrollbars=auto,width="+w+",height="+h+pos; 
o = window.open(URL,name,features);
o.focus();
}


function changeColor(name,color) 
{ 
document.getElementById(name).style.backgroundColor = color; 
//pro NN4 
if(document.layers) 
{ 
var n = eval("document."+name) 
n.bgColor = color 
} 

//pre ostatne prehliadace 
else 
{ 
var n = document.getElementById(name); 
n.style.backgroundColor = color; 

} 
} 

function switchVisibility(name)
    {
        element = document.getElementById(name + '_open');

        //alert(element.style.display);

        if (element.style.display == 'block')
        {
            element.style.display = 'none';
        } else {
            element.style.display = 'block';
        };

    }