code click open pdf

<iframe id="myFrame" style="display:none" width="500" height="300"></iframe>

<input type="button" value="Open PDF" onclick = "openPdf()"/>

<script type="text/javascript">

function openPdf()

{

var omyFrame = document.getElementById("myFrame");

omyFrame.style.display="block";

omyFrame.src = "http://quachson47.files.wordpress.com/2013/06/congty.pdf";

}

</script>