function ele(element)
{
	return document.getElementById(element);
}

function val(element)
{
	return document.getElementById(element).value;
}

function verlicht(id)
{
	for (i=1;i<=6;i++)
	{
		if (ele('c'+i+'_'+id))
			ele('c'+i+'_'+id).style.backgroundColor="#DFDFDF";
	}
}

function doof(id)
{
	for (i=1;i<=6;i++)
	{
		if (ele('c'+i+'_'+id))
			ele('c'+i+'_'+id).style.backgroundColor="white";
	}
}

var clicked;