Sample Code
<script language=javascript1.1> // return value will be here var colorhex = ''; function pop() { var colorwin = open("","picker", "width=630,height=440,status=no,directories=no," + "location=no,menubar=no,scrollbars=no,toolbar=no"); if (colorwin.opener == null) newin.opener = self; colorwin.document.close(); colorwin.focus(); colorwin.location.href = './p_gen.cgi' + // the next line supplies the initial color // value to the picker and may be omitted '?hex=' + document.forms.color.hex.value; return false; } </script>