<?PHP echo date("H:i:s"); ?>

<script language="JavaScript">  

var url = 'chas.php?rand=';  

function getXMLHTTPObject()  
{  
try {  
req = new XMLHttpRequest();  
} catch (err1)  
{  
try {  
req = new ActiveXObject("Msxml12.XMLHTTP");  
} catch (err2)  
{  
try {  
req = new ActiveXObject("Microsoft.XMLHTTP");  
} catch (err3)  
{  
req = false;  
}  
}  
}  
return req;  
}  

var http = getXMLHTTPObject();  

function handleHttpResponse() {  
if (http.readyState == 4) {  
document.getElementById('showtime').innerHTML = http.responseText;  
}  
}  

function gettime() {  
myRand = parseInt(Math.random()*999999);  
http.open("GET", url + myRand, true);  
http.onreadystatechange = handleHttpResponse;  
http.send(null);  
}  

</script>  
<a onmouseover="gettime()">Mини в/у мене</a><br>Часът е: <div id="showtime"></div>