function waitPreloadPage() { //DOM
	if (document.getElementById){
		document.getElementById('prepage').style.visibility='hidden';
	}else{
		if (document.layers){ //NS4
			document.prepage.visibility = 'hidden';
		}else { //IE4
			document.all.prepage.style.visibility = 'hidden';
		}
	}
}

function showPreloadPage() { //DOM
	if (document.getElementById){
		document.getElementById('prepage').style.visibility='';
	}else{
		if (document.layers){ //NS4
			document.prepage.visibility = '';
		}else { //IE4
			document.all.prepage.style.visibility = '';
		}
	}
}

function checkForm()
{
	var d = document.checkform;
	if (d.url.value == "http://" || d.url.value == "" && d.neuurl.value == "http://") { alert('Wrong url!'); return false; }
	
	showPreloadPage();
	return true;
}

function checkChallengeForm()
{
	var d = document.checkform;
	if (d.url1.value == "http://" || d.url1.value == "" || d.url2.value == "http://" || d.url2.value == "") { alert('Wrong url!'); return false; }
	
	showPreloadPage();
	return true;
}

function toggle(c,i)
{
	var d = document;
	
	if (d.getElementById(c).style.display == "none")
	{
		d.getElementById(c).style.display = "block";
		d.getElementById(i).src = "../images/icon_hide.gif";
		d.getElementById(i).alt = "Close";
	}
	else
	{
		d.getElementById(c).style.display = "none";
		d.getElementById(i).src = "../images/icon_show.gif";
		d.getElementById(i).alt = "Open";
	}
}