function getfinalamount() 
{ 
	var TargetField = document.getElementsByName ("payamount"); 	
//	alert(TargetField.length);
	var SourceField = document.getElementsByName ("selectoption");
//	alert(SourceField.length);
	var Disp = document.getElementById("disp1");
	var amt = document.getElementsByName ("amt").item(0).value;
//	alert(Disp.nodeName);
	var option = null; 
	option = SourceField[0].value; 
//	alert(option);
	switch (option) {
	case "0": 
		document.getElementsByName("payamount").item(0).value = amt*0.9 ;
		document.getElementById("disp1").innerHTML = "TOTAL DUE R" + amt*0.9 ; 
		break;
			
	case "1": 
		var amt1 = (amt * 30)/100; 
		
		document.getElementById("disp1").innerHTML = "TOTAL DUE R" + amt1  ; 
		document.getElementsByName("payamount").item(0).value = amt1 ;

		
		break; 

	case "2": 
		document.getElementById("disp1").innerHTML = "A representative will contact you shortly" ; 
		document.getElementsByName("payamount").item(0).value = "0";

	}


}