function Compute() {
	var dest = document.oddshape.dest.options[document.oddshape.dest.selectedIndex].value;
	var length = document.oddshape.length.value;
	var width = document.oddshape.width.value;
	var height = document.oddshape.height.value;

	if (isNaN(length)) {
		alert('Please enter numbers only.');
		document.oddshape.length.value = "";
		document.oddshape.length.focus();
		return false;
	}

	if (isNaN(width)) {
		alert('Please enter numbers only.');
		document.oddshape.width.value = "";
		document.oddshape.width.focus();
		return false;
	}

	if (isNaN(height)) {
		alert('Please enter numbers only.');
		document.oddshape.height.value = "";
		document.oddshape.height.focus();
		return false;
	}

	var total = Math.round(((length * width * height)/1728*dest) * 100)/100;
	if(total < 35) total = 35;
	document.oddshape.amount.value = '$' + total;

}