From http://www.w3schools.com (Copyright Refsnes Data)

VBScript Asc Function

The Asc function converts the first letter in a string to ANSI code, and returns the result.

Asc(string)

Parameter	Description
string	Required. A string expression. Cannot be an empty string!

document.write(Asc("A") & "<br />")
document.write(Asc("F"))

Output:

65
70

document.write(Asc("a") & "<br />")
document.write(Asc("f"))

Output:

97
102

document.write(Asc("W") & "<br />")
document.write(Asc("W3Schools.com"))

Output:

87
87

document.write(Asc("2") & "<br />")
document.write(Asc("#"))

Output:

50
35