function onClickCalculateIntersection()
{
	var m1 = 0.0;
	var b1 = 0.0;
	var m2 = 0.0;
	var b2 = 0.0;

	var x = 0.0; // Point of intersection.
	var y = 0.0;

	var message = '';

	m1 = parseFloat(window.document.input.m1.value);
	b1 = parseFloat(window.document.input.b1.value);
	m2 = parseFloat(window.document.input.m2.value);
	b2 = parseFloat(window.document.input.b2.value);

	x = (b2 - b1) / (m1 - m2);

	y = m1 * x + b1;

	message  = 'Point of intersection: \n'
	message += '(' + x + ', ' + y + ')';

	alert(message);
}