function calc()
		{
			f = document.sdltcalc;

			if (f.propval.value <= 175000) { window.document.getElementById("pres").innerHTML = '0'; }
			if ((f.propval.value > 175000) && (f.propval.value <= 250000)){ window.document.getElementById("pres").innerHTML = f.propval.value*0.01; }
			if ((f.propval.value > 250000) && (f.propval.value <= 500000)){ window.document.getElementById("pres").innerHTML = f.propval.value*0.03; }
			if (f.propval.value > 500000) { window.document.getElementById("pres").innerHTML = f.propval.value*0.04; }
		}
		function reset()
		{
			f = document.sdltcalc;
			f.propval.value = '';
			window.document.getElementById("pres").innerHTML = '0';
		}