$(document).ready(function(){

 
var downloadEvent = function(event) {
    
    	tgHref = $(event.currentTarget).attr('href');
          _gaq.push(['_trackEvent','downloadDocument',''+tgHref+'']);
}

$('a[href*=".pdf"]').each(function(){
    var re = $(this).attr('href');
    var pattern = /\.pdf$/;
    if (pattern.test(re)) {
          $(this).attr('target','_blank');
            $(this).click(downloadEvent);
    }
       
            
});
   
});