Web Page Error in javascript function

Question

Hi,

i am calling the below function from the button click in javascript

 

function print_page() {

alert('print_page');

// var ButtonControl = document.getElementById("btnprint");

// ButtonControl.style.visibility = "hidden";

// window.print();

}

<tr><td> <input type="button" id = "btnPrint" onclick="return print_page();" value="Print" /></td><%--window.print(); onclick="return print_page();"--%> 

 

 I am getting web page error as

Line:10 

'print_page' is undefined.

Pleaase help me how to rectify this