These are links for popup window. I understand all of it except for the numbers just after the link? Also is javascript:void necessary before window.open? Thank you.

<a href="http://www.link-elearning.com/linkdl/preview/signIn.php?hSajt=78b0fb7d034c46f13890008e6f36806b" onclick="javascript:void window.open('http://www.link-elearning.com/linkdl/preview/signIn.php?hSajt=78b0fb7d034c46f13890008e6f36806b','1386365686662','width=700,height=500,toolbar=1,menubar=1,location=0,status=1,scrollbars=1,resizable=1,left=0,top=0 ');return false;">Link na ITA DL Platformu</a>
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<a href="http://www.link-elearning.com/linkdl/preview/signIn.php?hSajt=78b0fb7d034c46f13890008e6f36806b" onclick="javascript:void window.open('http://www.link-elearning.com/linkdl/preview/signIn.php?hSajt=78b0fb7d034c46f13890008e6f36806b','1386366098181','width=700,height=500,toolbar=0,menubar=0,location=0,status=0,scrollbars=0,resizable=1,left=0,top=0 ');return false;">Link na ITA DL Platformu</a>