function getobject(obj){
if (document.getElementById)
return document.getElementById(obj)
else if (document.all)
return document.all[obj]
}



function setRoleAttribute(id, rolevalue) {
	if(document.getElementById(id)) {
		document.getElementById(id).setAttribute("role", rolevalue);
	}
}
function setAriaRoleElementsById() {
	setRoleAttribute("foto", "banner");
	setRoleAttribute("logo", "banner");
	setRoleAttribute("nav", "navigation");
	setRoleAttribute("content", "main");
	setRoleAttribute("impressum", "navigation");
}


function hideGoToTop(Event)
{
var Hoehe = getobject("wrapper").offsetHeight;
var Canvas = document.documentElement.clientHeight;

if ( document.clientHeight )	 {
   var Canvas = document.clientHeight;	}


	if (Canvas > Hoehe)	{
	  getobject("gototop").style.visibility = "hidden";	}

	else	{
	  getobject("gototop").style.visibility = "visible";	}
}

window.onscroll = function(){ hideGoToTop('scroll'); };
window.onresize = function(){ hideGoToTop('resi'); };
window.onload = function(){ hideGoToTop('load'); setAriaRoleElementsById(); };