Deep comparison in Javascript

deepEqual.js

function deepEqual(obj1, obj2)
{
	if (obj1 === obj2) {
		return true;
	}

	if (typeof(obj1) == typeof(obj2)) {
		if (typeof(obj1) == 'object') {
			var obj1Prop = 0;
			var obj2Prop = 0;

			for (var prop in obj1) {
				obj1Prop++;
			}

			for (var prop in obj2) {
				obj2Prop++;
			}

			if (obj1Prop != obj2Prop)
				return false;

			for (var prop in obj1) {
				if (prop in obj2) {
					if (!deepEqual(obj1[prop], obj2[prop]))
						return false;
				}
				else {
					return false;
				}
			}

			return true;
		}
		else {
			return (isNaN(obj1) && isNaN(obj2)) || obj1 === obj2;
		}
	}
	else {
		return false;
	}

}