>I know how to call com objects I created with Visual Foxpro useing
>VBscript, useing set createobject(), but how do you do it with javascript?

Example:

var fso;
fso = new ActiveXObject("Scripting.FileSystemObject");

The MSDN Library has a lot of information on both VBScript and JScript. See Platform SDK\Tools and Scripting\Scripting\Windows Script Technologies\JScript\JScript Users Guide as a starting point.