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Trying to implement twitter on my site

<a href="https://twitter.com/share" class="twitter-share-button" data-url="<%=strDomainSitename%>/Details.aspx?contentId=<%=strContentId%>" data-via="tom" data-lang="en">Tweet</a>

 

 !function(d,s,id){

    var js,fjs=d.getElementsByTagName(s)[0];

    if(!d.getElementById(id)){js=d.createElement(s);

    js.id=id;js.src= "//platform.twitter.com/widgets.js";

    fjs.parentNode.insertBefore(js,fjs);

    }}(document,"script","twitter-wjs");