function avail_validate(chkin,chkout){

	if (chkin.value == ""){
		alert("Please provide a Check-in date and a Check-out date. Thank you")
		return false
	}
	else{
		if (chkout.value == ""){
		alert("Please provide a Check-in date and a Check-out date. Thank you")
		return false	
		}	
	}
	return true
}