function rollmenu(string){
	obj = document.getElementById(string);
	obj.style.display='block';
	obj.style.visibilty='visible';
	obj.style.position='absolute';
}
function over_def(string){
	obj = document.getElementById(string);
	obj.style.display='none';
	obj.style.fontSize='0px';
	obj.style.lineHeight='0px';
	obj.style.visibilty='hidden';
}