function dynamicback()
{
	var backcanvas = document.getElementById('backcanvas');
	if (backcanvas.getContext)
	{
		drawcanvas = backcanvas.getContext('2d');
		var halfheight = backcanvas.height / 2;
		var backgrad = drawcanvas.createLinearGradient(0, halfheight, backcanvas.width, halfheight);
		backgrad.addColorStop(0, '#C0C0C0');
		backgrad.addColorStop(1, '#C0C090');
		drawcanvas.fillStyle = backgrad;
		drawcanvas.fillRect(0, 0, backcanvas.width, backcanvas.height);
	}
	else
	{
		//check cookies to see if previous warning given
		//if cookie does not exist, show warning
		//check if "do not show again" is clicked and store via cookie
	}
}