function showLayer(layerid, width)
{
	
	scrollTo(0,0);
	if (width==null||width=="")
		width = 450;

	document.getElementById(layerid + '_layer_1').style.display = '';
	document.getElementById(layerid + '_layer_2').style.display = '';
	document.getElementById(layerid + '_layer_2').style.width = width+'px';
	document.getElementById('overlay').className =  'overlay_on';

}

function hideLayer(layerid)
{
	document.getElementById('' + layerid + '_layer_1').style.display = 'none';
	document.getElementById('' + layerid + '_layer_2').style.display = 'none';
	document.getElementById('overlay').className = 'overlay_off';
}

function show(id) 
{ 
    document.getElementById(id).style.display = ''; 
}

function hide(id) 
{ 
    document.getElementById(id).style.display = 'none'; 
}

function toggle(id) 
{
	if(document.getElementById(id).style.display=='none') 
	{
		document.getElementById(id).style.display = '';
	} 
	else 
	{
		document.getElementById(id).style.display = 'none';
	}
}

function confirmAlert(question, delUrl) {
  if (confirm(question)) 
  {
    document.location = delUrl;
  }
}



function highlight_quickpost()
{
	document.getElementById('quickpost').className='maplink-off';
	document.getElementById('sysupdate').className='maplink-on';
	hide('sys_news');
	show('quickpost_div');
}

function highlight_sysupdate()
{
	document.getElementById('quickpost').className='maplink-on';
	document.getElementById('sysupdate').className='maplink-off';
	show('sys_news');
	hide('quickpost_div');
}

function validate_qp()
{
	var error  =  "Foutje:\n";	
	var no_error = "true";
	if(document.getElementById('title').value == '')
	{
		error = error + 'Je hebt geen titel ingevuld!\n';
		no_error = "false";
	}
	if(document.getElementById('text').value == '')
	{
		error = error + 'Je hebt geen bericht ingevuld!\n';	
		no_error = "false";
	}
	if(no_error == "false")
	{
		alert(error);
	}	
	else
	{
		document.getElementById('qpform').submit();
	}
}