$(document).ready(function(){
    $('#yourDiv a').attr('target', '_blank');
});

var myDiv = document.getElementById('mydiv');
var links = myDiv.getElementsByTagName('a');

for( var i = 0, len = links.length; i < len; i++ ) {
   links[i].target = "_blank";
}

$("a").attr({target:'_blank'});

$('#divWithWordLinks a').attr('target', '_blank');