function checkLogin() {

	if( isEmpty( document.login_info.user_name ) || isEmpty( document.login_info.password ) ) {
		alert( document.login_info.missing_info.value );
	} else {
		document.login_info.submit();
	}

	return false;
}

function checkNewCoop( coop_form ) {
	if( isEmpty( coop_form.email ) || isEmpty( coop_form.company ) || ( isEmpty( coop_form.name ) ) ) {
		alert( coop_form.missing_info.value );
		return false;
	}

	if( !isValidEmail( coop_form,coop_form ) ) {
		return false;
	}

	return confirm( "'"+coop_form.company.value+"' ("+coop_form.email.value+") "+coop_form.regist_prompt.value );
}

function setFileIndex( file_form,index ) {
	file_form.file_index.value = index;
	return true;
}

function checkRadioOn ( radioName, num, msg ) {
	var i;
	if ( num == 1 ) {
	   	if ( radioName.checked == true ) {
		    return true;
		}
	} else {
	    for (i=0; i<num; i++) {
		    if ( radioName[i].checked == true ) {
		    	return true;
		    }
		}
	}
	alert ( msg );
	return false;
}