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loading images with xmlhttp


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This code works, this code loads on a div different images based on a param (I have several buttons each one call sendToK(param) with different param values) outputContentPage basically return an image, depending on param passed My problem is:it takes a second time, maybe two seconds, from POINT1 and POINT2 (you find them on javascript code). In the meanwhile the div is empty, I mean it does not contain previous image and not yet the next.Why?My goal is to have no void transiction betweenan image and the other. Thanks!

<div style="background-color:blue">		<table>			<tr>				<td>										<input type="button" id="ButtonOpen" onclick="sendToK('Model Open \'cubo.kmo\'')" title="OpenModel" value="OpenModel" />									</td>			</tr>		 </table>	</div> 		<div style="background-color:green" id="ImgResult">		</div>

and the javascript

	function sendToK(comandString) {			var xmlhttp;			if (comandString == "") {				document.getElementById("ImgResult").innerHTML = "";				return;			}  			if (window.XMLHttpRequest) {// code for IE7+, Firefox, Chrome, Opera, Safari				//alert('new XMLHttpRequest ');				xmlhttp = new XMLHttpRequest();			}			else {// code for IE6, IE5				//alert('new ActiveXObject');				xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");			}  			xmlhttp.onreadystatechange = function () {				//alert('onreadystatechange');				if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {					//alert('onreadystatechange');					var output2 = xmlhttp.responseText;  					//alert("comandString " + comandString); //POINT 1 	   	 document.getElementById("ImgResult").innerHTML = output2;//POINT 2 				}				else {				  				  document.getElementById("ImgResult").innerHTML = "<img src='/img/notready.jpg' />";				}				  			}   			//xmlhttp.open("GET", "outputContentPage.aspx?c=" + comandString, true);			xmlhttp.open("POST", "outputContentPage.aspx?c=" + comandString, true);			xmlhttp.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');			xmlhttp.send();		} 

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