function ajax_booking(){
	var ajaxRequest;  // The variable that makes Ajax possible!
	
	try{
		// Opera 8.0+, Firefox, Safari
		ajaxRequest = new XMLHttpRequest();
	} catch (e){
		// Internet Explorer Browsers
		try{
			ajaxRequest = new ActiveXObject("Msxml2.XMLHTTP");
		} catch (e) {
			try{
				ajaxRequest = new ActiveXObject("Microsoft.XMLHTTP");
			} catch (e){
				// Something went wrong
				alert("Your browser broke!");
				return false;
			}
		}
	}
	// Create a function that will receive data sent from the server
	ajaxRequest.onreadystatechange = function(){
		if(ajaxRequest.readyState == 4){
			var ajaxDisplay = document.getElementById('ajaxDiv');
			ajaxDisplay.innerHTML = ajaxRequest.responseText;
		}
	}  
	var st_dest_id=document.getElementById('st_dest_id').value;
	var end_dest_id=document.getElementById('end_dest_id').value; 
	var return_trip=document.getElementById('selectMenu').value;
	var veh_counter=document.getElementById('veh_counter').value; 
	var vehicle_passanger='';
	for (i=1;i<=veh_counter;i++)
	{
	  var chkbox='chk'+i;
	  var passanger='s'+i;
	  if (document.getElementById(chkbox).checked == true){ 
	 	 var vehicle_id=document.getElementById(chkbox).value;
		 var passanger_count=document.getElementById(passanger).value;   
		 vehicle_passanger=vehicle_passanger+'**'+vehicle_id+'*'+passanger_count;
 	  } 
	}
	document.getElementById('ajaxDiv').innerHTML=" <font color='#000000'>Processing...</font> ";
	var queryString = "?st_dest_id="+st_dest_id+"&end_dest_id="+end_dest_id+"&return_trip="+return_trip+"&vehicle_passanger="+vehicle_passanger;
	ajaxRequest.open("GET", "ajax_booking.php" + queryString, true);
	ajaxRequest.send(null); 
}