function blocking(nr)
{
    if (document.layers)
    {
        current = (document.layers[nr].display == 'none') ? 'block' : 'none';
        document.layers[nr].display = current;
    }
    else if (document.all)
    {
        current = (document.all[nr].style.display == 'none') ? 'block' : 'none';
        document.all[nr].style.display = current;
    }
    else if (document.getElementById)
    {
        vista = (document.getElementById(nr).style.display == 'none') ? 'block' : 'none';
        document.getElementById(nr).style.display = vista;
    }
}

function toggleText(id,text1,text2) 
{
    var DomObject = document.getElementById(id);
    DomObject.innerHTML = (DomObject.innerHTML == text1) ? text2 : text1;
}

function clickButton(e, buttonid)
{ 
    var evt = e ? e : window.event;
    var bt = document.getElementById(buttonid);
    if (bt)
    { 
        if (evt.keyCode == 13)
        { 
            bt.click(); 
            return false; 
        } 
    } 
}

var ddmenuitem	= 0;

// open hidden layer
function mopen(id)
{	
	// close old layer
	if(ddmenuitem) ddmenuitem.style.visibility = 'hidden';

	// get new layer and show it
	ddmenuitem = document.getElementById(id);
	ddmenuitem.style.visibility = 'visible';

}
// close showed layer
function mclose()
{
	if(ddmenuitem) ddmenuitem.style.visibility = 'hidden';
}

// close layer when click-out
document.onclick = mclose;