textbox text Changed

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Java

script

Hi All,
I used nearly ten textbox on a page. In that ten i need to use five textbox and one combobox only used for my calculation. Three text box and one combox used to give a input. Two are shows the out put. When i enter input to textbox1 and combobox it shows out in textbox5 and texbox4. vice versa for textbox 2 and 3.

tamil=textbox1.text
english=textbox2.text
maths=textbox3.text
attendancemark(2,4,6,8,10)=combobox
avg=tamil+english+maths/3
textbox4.text=avg
textbox5.text=avg+combobox

Protected Sub TextBox1_TextChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles TextBox1.TextChanged
       If TextBox1.Text = "" Then
           TextBox1.Text = 0
       ElseIf TextBox2.Text = "" Then
           TextBox2.Text = 0
       ElseIf TextBox3.Text = "" Then
           TextBox3.Text = 0
       ElseIf DropDownList1.SelectedItem.Text = "" Then
           DropDownList1.SelectedItem.Text = 0
       End If
       a = TextBox1.Text
       b = TextBox2.Text
       c = TextBox3.Text
       d = DropDownList1.SelectedItem.Text
       sum = a + b + c / 3
       subtract = sum + d
       TextBox4.Text = sum
       TextBox5.Text = subtract
   End Sub

how can i do tis in java script.............



Please help me for this thank you.
S.Priyan