stop asp.net btnsave.click event from firing when validation fails

I have this java script validation function that fires when the client clicks btnsave if the text of the text box is empty then a message box is displayed and the focus is on the text box but i cannot seem to prevent the page from posting back when the validation fails AM I missing something. here is my code function validate() { var itemscanned; itemscanned = document.getElementById('txtItemCode'); if (itemscanned.value == '') { alert("Plz Enter Item Code"); return false; itemscanned.focus } else { alert(itemscanned.value); } }
Is this the submit button for the form?

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