function doit(){
	var val=document.getElementById('c1value').value;
	var time;
	if (document.forms[0].firsttime.checked) {
		time = document.forms[0].firsttime.value;	
	}
	var percent;

		 if (time == "set" && val <= 250000)
		 	percent=0;
	else if (val > 1000000)
		 	percent=5;
	else if (val>500000) 
	      	percent=4;
	else if (val>250000) 
		percent=3;
	else if (val>175000) 
		percent=1;
	else
		percent=0;
	var duty=val*percent/100;

	document.getElementById('c1duty').value=
		isFinite(duty)?duty.toFixed(0):'----';
	setTimeout("doit();", 1);
}
doit();