function hallo(){
	
	var hari,newtgl;
	hari=2; //penambahan hari
	
	tgl = document.getElementById('from_date_Day_ID').value;
	bln = document.getElementById('from_date_Month_ID').value;
	thn = document.getElementById('from_date_Year_ID').value;
	
	newtgl= parseInt(tgl);
	newtgl+=hari;
	
	nextdate = bln +"/"+newtgl+"/"+thn;

	document.getElementById('until_date_Month_ID').value=bln;	
	document.getElementById('until_date_Year_ID').value=thn;		
	document.getElementById('until_date_Day_ID').value=newtgl;
	
	alert(document.getElementById('to_date').value);	
}


   if (from_date < until_date) {
       alert("Wrong Date!");
        // whatever you want to do here
  }