function toggleElement(elname)
{
	var el = document.getElementById(elname);
	if (el.style.display == 'none') {
		el.style.display='block';
	}
	else{
		el.style.display='none';
	}	
}

function toggleMenuElement(img,elname, style1, style2)
{
	var el = document.getElementById(elname);
	if (el.style.display == 'none') {
		el.style.display='block';
	}
	else{
		el.style.display='none';
	}	

	if( img.src == style1 )
		img.src = style2;
	else
		img.src = style1;
}
function invisibleElement(elname)
{
	var el = document.getElementById(elname);
	el.style.visibility='hidden';
}
function uninvisibleElement(elname)
{
	var el = document.getElementById(elname);
	el.style.visibility='visible';
}

function showElement(elname)
{
	var el = document.getElementById(elname);
	el.style.display='block';
}
function hideElement(elname)
{
	var el = document.getElementById(elname);
	el.style.display='none';
}