var numberPrizesRemaing = 0 

function calculate() {

prizeAmount = (document.aspnetForm.ctl00$ContentPlaceHolder1$tb_Donation.value)
splitString = prizeAmount.split("-")
prizeAmount = (splitString[1])


A = document.aspnetForm.ctl00$ContentPlaceHolder1$tb_38.value
B = document.aspnetForm.ctl00$ContentPlaceHolder1$tb_39.value
C = document.aspnetForm.ctl00$ContentPlaceHolder1$tb_40.value
D = document.aspnetForm.ctl00$ContentPlaceHolder1$tb_41.value
E = document.aspnetForm.ctl00$ContentPlaceHolder1$tb_42.value
F = document.aspnetForm.ctl00$ContentPlaceHolder1$tb_43.value
G = document.aspnetForm.ctl00$ContentPlaceHolder1$tb_44.value
H = document.aspnetForm.ctl00$ContentPlaceHolder1$tb_45.value
I = document.aspnetForm.ctl00$ContentPlaceHolder1$tb_46.value
J = document.aspnetForm.ctl00$ContentPlaceHolder1$tb_47.value
K = document.aspnetForm.ctl00$ContentPlaceHolder1$tb_48.value
L = document.aspnetForm.ctl00$ContentPlaceHolder1$tb_49.value
M = document.aspnetForm.ctl00$ContentPlaceHolder1$tb_50.value
N = document.aspnetForm.ctl00$ContentPlaceHolder1$tb_51.value
O = document.aspnetForm.ctl00$ContentPlaceHolder1$tb_52.value
P = document.aspnetForm.ctl00$ContentPlaceHolder1$tb_53.value

A = Number(A)
B = Number(B)
C = Number(C)
D = Number(D)
E = Number(E)
F = Number(F)
G = Number(G)
H = Number(H)
I = Number(I)
J = Number(J)
K = Number(K)
L = Number(L)
M = Number(M)
N = Number(N)
O = Number(O)
P = Number(P)


numberPrizesChosen = ( A + B + C + D + E + F + G + H + I + J + K + L + M + N + O + P)

numberPrizesRemaing = (prizeAmount-numberPrizesChosen)

		if (numberPrizesRemaing < 0)
			{
				
				document.aspnetForm.ctl00$ContentPlaceHolder1$tb_SelectedTickets.value = numberPrizesChosen
				document.aspnetForm.ctl00$ContentPlaceHolder1$tb_TicketsLeft.value = "0"
				document.getElementById("ctl00_ContentPlaceHolder1_lb_ErrorMsg").innerHTML = "Please choose " + Math.abs(numberPrizesRemaing) + " tickets less!<br /><br />"
			}
		else
			{
				
				
				document.aspnetForm.ctl00$ContentPlaceHolder1$tb_SelectedTickets.value = numberPrizesChosen			
				document.aspnetForm.ctl00$ContentPlaceHolder1$tb_TicketsLeft.value = numberPrizesRemaing
				document.getElementById("ctl00_ContentPlaceHolder1_lb_ErrorMsg").innerHTML = " "
			}
					
			
}


				
	
	function maskKeyPress(objEvent) 
	{
	  var iKeyCode;  	
	  iKeyCode = objEvent.keyCode;			
	  if(iKeyCode>=48 && iKeyCode<=57) return true;
	  return false;
	}