function openDiv(id){
	document.getElementById(id).className='show';
}
function closeDiv(id){
	document.getElementById(id).className='hide';
}

function popup(file,name,width,height) {
	x = (640 - width)/2, y = (480 - height)/2;
	if (screen) {
		y = (screen.availHeight - height)/2;
		x = (screen.availWidth - width)/2;
	}
	if (screen.availWidth > 1800) {
		x = ((screen.availWidth/2) - width)/2;
	}
	var newWindow = window.open(file,name,'width='+width+',height='+height+',screenX='+x+',screenY='+y+',top='+y+',left='+x+',scrollbars=auto,toolbar=no,menubar=no,status=no');
}