There are situations mail id from a text box needs to be populated in the outlook or any other mail client by calling mailto: Here is the one way to do it. <html> <head> <script> function sendMail(){ var mailToId = document.forms[0].mailId.value; var mailto_link = 'mailto:'+mailToId; win = window.open(mailto_link,'tempWindow'); if (win && win.open &&!win.closed) win.close(); } </script> <head> <body> <form name= "mailForm" > ...