/*-----------Rajendra Vyas ------------------------*/
/*-----------Date 3-July-2009 ------------------------*/
function ajaxObject(layer, url) 
{											// This is the object constructor   
	var that=this;							// A workaround for some javascript idiosyncrocies   
	var updating = false;					// Set to true if this object is already working on a request   
	this.callback = function() {}			// A post-processing call -- a stub you overwrite.   
	this.update = function(passData) {		// Initiates the server call.      
					if (updating==true) 
					{ 
						return false;		// Abort if we're already processing a call.      
					}	
					LayerID.innerHTML="Please wait while your request is processing....";
					updating=true;							// Set the updating flag.
					var AJAX = null;						// Initialize the AJAX variable.
					if (window.XMLHttpRequest) 
					{										// Are we working with mozilla? 
						AJAX=new XMLHttpRequest();			//  Yes -- this is mozilla.      
					}
					else 
					{										// Not Mozilla, must be IE 
						AJAX=new ActiveXObject("Microsoft.XMLHTTP");	//  Wheee, ActiveX, how do we format c: again? 
					}										// End setup Ajax.
					if (AJAX==null) 
					{										// If we couldn't initialize Ajax...
						alert("Your browser doesn't support AJAX.");		// Sorry msg.   
						return false;						// Return false (WARNING - SAME AS ALREADY PROCESSING!) 
					}
					else 
					{
						AJAX.onreadystatechange = function(){		// When the browser has the request info.. 
																if (AJAX.readyState==4 || AJAX.readyState=="complete") 
																{			//   see if the complete flag is set.
																	LayerID.innerHTML=AJAX.responseText;			//   It is, so put the new data in the object's layer
																	delete AJAX;									//   delete the AJAX object since it's done. 
																	updating=false;									//   Set the updating flag to false so we can do a new request
																	that.callback();								//   Call the post-processing function. 
																}	// End Ajax readystate check.
															}// End create post-process fucntion block.
						var timestamp = new Date();			// Get a new date (this will make the url unique) 
						var uri=urlCall+'?'+passData+'&timestamp='+(timestamp*1);// Append date to url (so the browser doesn't cache the call)
						AJAX.open("GET", uri, true);		// Open the url this object was set-up with.
						AJAX.send(null);					// Send the request.
						return true;// Everything went a-ok.
					}// End Ajax setup aok if/else block
	}
	// This area set up on constructor calls.
	var LayerID = document.getElementById(layer);// Remember the layer associated with this object.
	var urlCall = url;// Remember the url associated with this object.
}// End AjaxObject