<a href=# onclick="return down()">download</a>
<script>
function down()
{
   var down1=window.open('1.zip','down1','height=100,width=100');
   var down2=window.open('2.zip','down2','height=100,width=100');
   var down3=window.open('3.zip','down3','height=100,width=100');
   return false;
}
</script>試一試