function fctPrint(){
	window.print();
}
function fctClose(){
	window.close();
}
function calc_cfeet (thickness, sqrft) {
	var t = parseFloat (thickness);
	var f = parseFloat (sqrft);
	return Math.ceil (t * f);
}
function calc_cyard (thickness, sqrft) {
	var t = parseFloat (thickness);
	var f = parseFloat (sqrft);
	return Math.ceil (10 * t * f / 27)/10;
}
function calc_values () {
	var tindex = document.calc_form.thickness.selectedIndex;
	var thickness = document.calc_form.thickness.options[tindex].value;
	var sqrft = document.calc_form.sqft.value;
	var c_feet = calc_cfeet (thickness, sqrft);
	var c_yard = calc_cyard (thickness, sqrft);
	var c_feet_2b = Math.ceil (calc_cfeet (thickness, sqrft) / 2);
	var c_feet_3b = Math.ceil (calc_cfeet (thickness, sqrft) / 3);
	var pu_lds = Math.ceil (calc_cyard (thickness, sqrft) / 1.5);
	
	document.calc_form.ft_total.value=c_feet;
	document.calc_form.ya_total.value=c_yard;
	document.calc_form.ft2_total.value=c_feet_2b;
	document.calc_form.ft3_total.value=c_feet_3b;		
	document.calc_form.pu_total.value=pu_lds;
	return false;
}