//  simpleStringMaker takes any string, and converts it to a simple, jpg-friendly name.

simpleStringMaker = function ( thestring, extension ) {
    newstring = "";  //  Init
    for ( i = 0; i < thestring.length; i++ ) {  //  Loop through the string
        if ( (thestring.charCodeAt(i) > 47 && thestring.charCodeAt(i) < 58) || (thestring.charCodeAt(i) > 96 && thestring.charCodeAt(i) < 123) || (thestring.charCodeAt(i) > 64 && thestring.charCodeAt(i) < 91) ) {
            newstring += thestring.charAt(i).toLowerCase();  //  If the string's char is a letter (upper or lower case) or a number, add it to newstring.  Ignore it if it's anything else.  Also, set the char to lower case either way.
        }
    }
    trace( newstring + extension );  //  Return
}
simpleStringMaker ( "It's 419 : Gotta Minute..?!", ".jpg" );  //  Test

simpleStringMaker

ActionScript