function checkSearch(){

var keyword = document.getElementById('search_keyword').value;

if(keyword == '' || keyword.length <= 3){
	alert('Invalid keyword detected\n Minimal of 4 characters are valid.\n Please try again');
	return false;
}else{
	setMn();
	return true;
}

}

function setMn(){

var mn = document.getElementById('mn').value;
var search_table = document.getElementById('search_table').value;

	switch (search_table)
	{
		case 'bi_burung':
		case 'bi_IBA':
		case 'bi_EBA':
		case 'bi_book':
			mn = 'db'; 
		break;

		case 'bi_artikel':
			mn = 'na'; 
		break;

		default :
			mn = 'db';
		break;
	}
//alert(search_table+" : "+mn);
}