var navClicked = false;

function nav(page, keywords, params, direction, totalItems, sort)
{
	if(navClicked == false){
		navClicked = true;
		if (document.getElementById('btnNext')) document.getElementById('btnNext').disabled = true;
		if (document.getElementById('btnBack')) document.getElementById('btnBack').disabled = true;
		url = "webshop.asp?act=catalog&page="+page+"&direction="+direction+"&keywords="+keywords+""+params+"&totalItems="+totalItems+"&sort="+sort;
	
		document.location.href = url;
	}
}

function navthema(page, keywords, params, direction, totalItems, sort)
{
	if(navClicked == false){
		navClicked = true;
		if (document.getElementById('btnNext')) document.getElementById('btnNext').disabled = true;
		if (document.getElementById('btnBack')) document.getElementById('btnBack').disabled = true;
		url = "webshop.asp?act=catalog&page="+page+"&direction="+direction+"&keywords="+keywords+""+params+"&totalItems="+totalItems+"&sort="+sort;
	
		document.location.href = url;
	}
}

function calcHeight()
{
  var the_height = document.getElementById('externalframe').contentWindow.document.body.scrollHeight;

  document.getElementById('externalframe').height= the_height;
}

function isNumber(input){
	if (input.value.length > 0 && !input.value.match(/^[0-9.,]+$/g))
	{
	   input.value = input.value.replace(/[^0-9.,]*/g,'');
	}
}

function checkID(id)
{
	var el = document.getElementById('machtigingInfo');
	if (el)
	{
		if ( (id == '07') || (id == 'chkVriend') )
		{
			if (el.style.display == 'none')
				el.style.display = 'block';
			else
				el.style.display = 'none';
		}
		else
		{
			el.style.display = 'none';
		}
	}
}