// Checks if a given string is a valid e-mail address function isEmail (addr) { if ( addr.value.indexOf("@") != "-1" && addr.value.indexOf(".") != "-1" && addr.value != "" ) return true; else return false; } // Checks if a given form field has a value function isFilled (s) { if ( s.value == "" || s.value == null ) return false else return true; } // Shows an error message function showError (msg , styleSheet) { var content = "Error"; if ( styleSheet != null && styleSheet.length > 0 ) { content = content + ""; } content = content + " " + "

" + "

" + msg + "

" + "

Please revise your input.

" + "


" + "

" + "Close" + "

" errorwin = window.open("", "", "width=300,height=250,scrollbars=yes"); errorwin.document.write(content); errorwin.document.close(); return true; } // Shows sponsor URL on a separate window function showSponsor ( sponsorURL ) { if ( sponsorURL != "" ) { window.open( sponsorURL, "sponsorWin", "width=640,height=480,scrollbars,location,resizable,status"); } return false; }