Javascript Function to print data inside a div
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function CallPrint(div_id)
{
var prtContent = document.getElementById(div_id);
var WinPrint =window.open('','','left=0,top=0,width=1,height=1,t oolbar=0,scrollbars=0,status=0');
WinPrint.document.write(prtContent.innerHTML);
WinPrint.document.close();
WinPrint.focus();
WinPrint.print();
WinPrint.close();
prtContent.innerHTML=strOldOne;
}
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where div_id is the id of that div

Example:
<div id="div_id">
A cool website
</div>
<input type="button" value="Print" onclick="CallPrint('div_id')"/>