function setChatTimeCheck(fld){
	var today = new Date();
	var hour = today.getHours();
	
	if((8 < hour && hour < 12) || (12 < hour && hour < 18)){
		document.getElementById(fld+'_on').style.display = '';
		document.getElementById(fld+'_off').style.display = 'none';		
	}else{
		document.getElementById(fld+'_off').style.display = '';
		document.getElementById(fld+'_on').style.display = 'none';
	}
}