When I am counting the given subject mark, am getting onchange error

[1997vinny]

This is my client script code:

  If(newValue)

        {

        var t = parseInt(g_form.getValue('u_telugu'));

        var h = parseInt(g_form.getValue('u_hindi'));

        var e = parseInt(g_form.getValue('u_english'));

        var m = parseInt(g_form.getValue('u_maths'));

        var sc = parseInt(g_form.getValue('u_science'));

        var so = parseInt(g_form.getValue('u_social'));

        var tl = parseInt(t + h + e + m + sc + so);

        g_form.setValue('u_total', tl);

        }

Error: onChange script error: ReferenceError: If is not defined function () { [native code] }

I given all subject marks after given the social marks, going to total tab.

I am getting this error.

How to resolve this error?