Array textbox validation JS1

<br /> <br /><script language="JavaScript"> <br />function validate() <br />{ <br /> <br /> <br /> var chks = document.getElementsByName('charge[]'); <br /> for (var i = 0; i < chks.length; i++) <br /> { <br /> <br />if(chks[i].value=='') { <br /> <br /> alert("Enter Amount !"); chks[i].focus(); return false; <br /> <br /> }else{ <br /> <br />if(isNaN(chks[i].value)){ alert("Enter only Numbers !"); chks[i].focus(); return false;} <br /> <br />} <br /> <br /> } <br /> <br />return true; <br />} <br /></script> <br /> <br /> <br /> <br />