function onKeyPress()
{
	if ( ( document.getElementById("Business").value.length == 0 ) ||
		( document.getElementById("House").value.length == 0 ) ||
		( document.getElementById("Savings").value.length == 0 ) ||
		( document.getElementById("Investments").value.length == 0 ) ||
		( document.getElementById("LifePolicies").value.length == 0 ) ||
		( document.getElementById("OtherAssets").value.length == 0 ) ||
		( document.getElementById("Mortgage").value.length == 0 ) ||
		( document.getElementById("Loans").value.length == 0 ) ||
		( document.getElementById("OtherLiabilities").value.length == 0 ) )
		document.getElementById("Calculate").disabled = true;
	else
		document.getElementById("Calculate").disabled = false;
}