The blank tab is opened by window.open() in ie win8.1

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Javascript

Windows

Win8

IE11

Mail functionality was not working in Win8.1 as the string length was very big.Using classic asp code.
So I have changed the code as below:
Previous code:




Changed code:

<a href ="#" onclick="javascript:doMailto(); return false;">Send Email</a>

<script type="text/javascript">
   var sMailto = "mailto:mail@something.com;mail@something.com;mail@something.com?subject=A really long subject can go here if you want and it will work Im telling you&body=Click for detailed profileClick for detailed profileClick for detailed profileClick for detailed profileClick for detailed profileClick for detailed profileClick for detailed profileClick for detailed profileClick for detailed profileClick for detailed profileClick for detailed profileClick for detailed profileClick for detailed profileClick for detailed profileClick for detailed profileClick for detailed profileClick for detailed profileClick for detailed profileClick for detailed profileClick for detailed profileClick for detailed profileClick for detailed profileClick for detailed profileClick for detailed profileClick for detailed profileClick for detailed profileClick for detailed profileClick for detailed profile&cc= &bcc= mail@something.com";

   function doMailto() {
      window.open(sMailto);
   }

</script>

After this cahnge the mail is opening but a new blank tab is opening in the IE. How to prevent this opening of a new tab?

Thanks in Advance.