VBScript Prime Number Generator

This is a really cool HTML application which finds all the prime numbers in a given range. This program is pretty fast for low ranges and may raise the core usage to 100 or 90 percent for very large ranges. So I prevented large ranges from being entered as it caused some errors and caused the computer to crash.

The VBScript used in the program is really simple. The program tries to get a integer number by dividing it with all possible numbers and if does not get an integer the number is confirmed as a prime number. This process is repeated for all the numbers in the given range.

To make the program paste the following code in notepad and save with a .hta extension.

<html>
<head>
<title>PRIME CALCULATOR</title>
<HTA:APPLICATION
  APPLICATIONNAME="PRIME CALCULATOR"
  ID="PRIMECALCULATOR"
  VERSION="1.0"
  MAXIMIZEBUTTON="no"
  SCROLL="no"/>
</head>

<script language="VBScript">

Sub Window_OnLoad
   Dim width,height
   width=500
   height=475
   self.ResizeTo width,height
   RID.value = 0
End Sub

Function PVal
If (BTN.value = "Stop") Then
SID.value = 1
Else If (boxa.value = "" Or boxb.value = "") Then
MsgBox("Enter a range!")
Else If ((boxa.value = boxb.value) Or (Int(boxa.value) > Int(boxb.value))) Then
MsgBox("Are you mad? Enter a valid range!")
Else If (Int(RID.value) = 1) Then
RID.value = 1
Else
boxa.readonly = True
boxb.readonly = True
PSet()
End If
End If
End If
End If
End Function

Function PSet
If (boxa.value <= 0) Then
boxa.value = 1
Else
End If
code.value = ""
count.value = 0
anum.value = boxa.value
bnum.value = boxb.value
BTN.value = "Stop"
SID.value = 0
RID.value = 1
ID.Value = 1
PStart()
End Function

Function PStart
anum.value = Int(anum.value)+1
If (Int(anum.value) = Int(boxb.value)) Then
PStop()
Else If (SID.value = 1) Then
PSStop()
Else
calculate(Int(anum.value))
End If
End If
End Function

Function Calculate(num)
chk = 1
rmn = 1
Do Until chk = num-1
chk = chk+1
rmn = num Mod chk
If (rmn = 0) Then Exit Do
Loop
If (rmn = 0) Then
code.value = code.value
Else
code.value = code.value & ", " & num
code.doScroll
count.value = count.value+1
End If
Do While ((Int(ID.value) = 1) And (Code.value <> ""))
code.value = Replace(code.value, Left(code.value, 2), "", "1", "1")
ID.value = 0
Loop
Junk = SetTimeOut("PStart()", 1)
End Function

Function PStop
BTN.value = "Calculate"
Junk = MsgBox(count.value & " prime numbers found between the range " & boxa.value & "-" & boxb.value & "!", 64, "INFO")
ID.value = 1
RID.value = 0
boxa.readonly = False
boxb.readonly = False
End Function

Function PSStop
BTN.value = "Calculate"
ID.value = 1
RID.value = 0
boxa.readonly = False
boxb.readonly = False
End Function

</script>

<body style="font-family:BookMan Old Style;">
<input type="hidden" id="RID">
<input type="hidden" id="ID">
<input type="hidden" id="SID">
<input type="hidden" id="count">
<input type="hidden" id="bnum">
<input type="hidden" id="anum">
<table align="center" border="1">
<caption><hr><b>PRIME CALCULATOR</b><hr></caption>
<tr>
<td>Enter the range of prime numbers you want and click Calulate to get all the prime numbers in that range!<hr></td>
</tr>
<tr>
<td align="center"><input type="text" id="boxa" size="10" onkeypress="If (window.event.keycode < 48 Or window.event.keycode >57) Then window.event.returnvalue = False"> To: <input type="text" id="boxb" size="10" onkeypress="If (window.event.keycode < 48 Or window.event.keycode >57) Then window.event.returnvalue = False"></td>
</tr>
<tr>
<td align="center"><input type="button" id="BTN" value="Calculate" onclick="PVal"></td>
</tr>
<tr>
<td align="center"><textarea wrap="virtual" id="Code" cols="52" rows="12" readonly></textarea></td>
</tr>
<tr>
<td align="right"><span style="font-size:10;">Copyright © 2013 | Prime Calculator - By #XByte</span></td>
</tr>
</table>
</body>
</html>