var initBody 

function beforePrint()
{ 
initBody = document.body.innerHTML; 
document.body.innerHTML = idPrint.innerHTML;
} 
function afterPrint()
{ 
document.body.innerHTML = initBody;
} 
function printArea() 
{ 
window.print(); 
} 
window.onbeforeprint = beforePrint; 
window.onafterprint = afterPrint;