function OpenNewWindow(mypage,w,h,myname){
   var winl = (screen.width-w)/2;
   var wint = (screen.height-h)/2;
   var settings = 'height=' + h + ',width=' + w + ',top=' + wint + ',left=' + winl + ',scrollbars=no,toolbar=no';
   var win = window.open(mypage, null, settings);
   if (parseInt(navigator.appVersion) >= 4) {
       win.window.focus();
   }
}

function numbersonly(evt) {
	var e = evt;
	if(window.event){ // IE
		var charCode = e.keyCode;
	} else if (e.which) { // Safari 4, Firefox 3.0.4
		var charCode = e.which;
	}
	if (charCode > 31 && (charCode < 48 || charCode > 57))
	return false;
	return true;
}