javascript - how to make alert prompt only display once? -

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i want alert apear once. 

<head>     <script type="text/javascript">     var name;     name = window.prompt("enter name");     </script> </head>

this in body

<div style="left:750px;top:60px;position:absolute;">     <script type="text/javascript">         document.writeln("welcome "+name+" !");  //name request display here     </script> </div>

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also promotion popup when page load

here promotion.html

<body> <script type="text/javascript">  popupcenter()  //for name enter on request form </script> </body>

here promotion.html:-

<body>        <div id="promotion">      <table border="1">                  <tr><td><p>             <script language="javascript">                 <!--                 promo = new array                 promo[1]="promotion!!! save 50% if buy more $300"                 promo[2]="open every monday saturday!!!! 9 a.m 10 p.m"                 promo[3]="the 100th customer win free reel & spool!!"                 promo[4]="labour sale day 20% off!! labour sale day 20% off!!"                 promo[5]="custom parts , reels bearing 10% off!!!"                 promo[6]="come now!! hurry!! while promotion still available!!"                 promo[7]="shimano $230, noww $98!!!"                  random_num = (math.round((math.random()*6)+1))                  document.write(promo[random_num]);                 -->                 </script>             </p></td></tr>                 </table>      </div>        </body>

in .js file promotion.html

 function popupcenter(pageurl, title,w,h) {         var left = (screen.width/2)-(w/2);         var top = (screen.height/2)-(h/2);         var targetwin = window.open ("promotion.html", "promotion", 'toolbar=no, location=no, directories=no, status=no, menubar=no, scrollbars=no, resizable=yes, copyhistory=no, width='+580+', height='+485+', top='+100+', left='+400);          }          return sessionstorage.popupccenter=1;

keep copy in sessionstorage, check existance ask if not there

function getname() {     var n, q = 'enter name';     if (!window.sessionstorage) {  // if sessionstorage not supported         return window.prompt(q); // perform other action     }     n = window.sessionstorage.getitem('name');     if (!n) {         n = window.prompt(q);         window.sessionstorage.setitem('name', n);     }     return n; }

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