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;
	}