function open1() {
      win1 = window.open("links/a.html","","width=245,height=600,top=100,left=900");
   }

function open2() {
      win2 = window.open("links/b.html","","width=245,height=600,top=100,left=900");
   }


function open3() {
      win3 = window.open("links/c.html","","width=245,height=600,top=100,left=900");
   }
   
function open4() {
      win4 = window.open("links/d.html","","width=245,height=600,top=100,left=900");
   }