function setCookie(name, value, expiredays)
{ 
	var expire = new Date();
	
	expire.setTime(expire.getTime() + (expiredays * 24 * 3600 * 1000));	
	document.cookie = name + "=" + escape(value) +
		((expiredays == null) ? "" : ";expires=" + expire.toGMTString()) + ";path=/";
}

function updateScreen(screen_size)
{	
	var toggle_size = 990;
	var img_name    = 'wider';
	var img_desc	= 'increase screen width';
	
	if (parseInt(screen_size) != 790) {
		toggle_size = 790;
		screen_size = 990;
		img_name	= 'thinner';
		img_desc	= 'reduce screen width';
	}
	setCookie('SCREEN_WIDTH', screen_size, 240);
	if (document.getElementById) {
		document.getElementById('parent').style.width = screen_size + 'px';
		document.getElementById('screen').innerHTML = '<a href="#" onclick="javascript:updateScreen(\'' + toggle_size + '\');" title="' + img_desc + '"><img src="/images/icons/' + img_name + '.gif" border="0" alt="rpg icon"></a>';
	}
}