function popup(file) {
		window.open('../scripts/popup.php?f='+file,
					'_blank',
					'toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=no,resizable=no,copyhistory=yes,width=10,height=10');
	}

	function chechthebox() {
		if (document.form1.checkbox.checked==false) {
			document.form1.checkbox.checked=true;
			document.form1.book.disabled=false;
		}
		else {
			document.form1.checkbox.checked=false;
			document.form1.book.disabled=true;
		}
	}
	
	function enablebutton() {
		if (document.form1.book.disabled==true) {
			document.form1.book.disabled=false;
		}
		else
		{
			document.form1.book.disabled=true;
		}
	}
	
	function gotobook() {
		window.location='book.php?excid=';
		}