function checkForm() {
	if (document.frmMessageForm.songname.value == ''){
		alert("Ten bai hat?");
		document.frmMessageForm.songname.focus();
		return false;
	}
	if (document.frmMessageForm.source.value == '') {
		alert("Nguon file nhac?");
		document.frmMessageForm.source.focus();
		return false;
	}
	if ((document.frmMessageForm.catid.value == '0') && (document.frmMessageForm.catname.value =='')){
		alert("The loai?");
		return false;
	}
	if ((document.frmMessageForm.composerid.value == '0') && (document.frmMessageForm.composername.value =='')){
		alert("Sang tac?");
		return false;
	}
	if ((document.frmMessageForm.singerid.value == '0') && (document.frmMessageForm.singername.value =='')){
		alert("The hien?");
		return false;
	}
}
function checkForm2() {
	if (document.frmMessageForm.albumname.value == ''){
		alert("Tieu de Album nhac?");
		document.frmMessageForm.albumname.focus();
		return false;
	}
	if ((document.frmMessageForm.singerid.value == '0') && (document.frmMessageForm.singername.value =='')){
		alert("The hien?");
		return false;
	}
}