function einblenden(x) 
{ 
	document.getElementById(x).style.position="relative";
	document.getElementById(x).style.visibility="visible";
} 

function ausblenden(x)
{ 
	document.getElementById(x).style.position="absolute";
	document.getElementById(x).style.visibility="hidden";
} 

function changeVisibility(x) 
{
if(document.getElementById(x).style.visibility=='hidden')
	{
	einblenden(x);
	} 
    else
	{
	ausblenden(x);
	} 
}