var d = new Date();
var time = d.getHours();

if (time < 7 || time > 19) 
{
	document.write('<a href="http://jigsaw.w3.org/css-validator/check/referer"><img style="border:0; width:88px; height:31px" src="pictures/vcss-blue.png" title="www.rebe.cc is valid CSS" alt="Valid CSS!" /></a>');
}
else
{
	document.write('<a href="http://jigsaw.w3.org/css-validator/check/referer"><img style="border:0; width:88px; height:31px" src="pictures/vcss.png" title="www.rebe.cc is valid CSS" alt="Valid CSS!" /></a>');
}