function getpa(fld){
var page = fld;
var xmlhttp=false; //Clear our fetching variable
       try {    xmlhttp = new ActiveXObject('Msxml2.XMLHTTP'); //Try the first kind of active x object…
   } catch (e) {
                try {
                      xmlhttp = new
                       ActiveXObject('Microsoft.XMLHTTP'); //Try the second kind of active x object
        } catch (E) {
              xmlhttp = false;

                        }
       }
      if (!xmlhttp && typeof XMLHttpRequest!='undefined') {
              xmlhttp = new XMLHttpRequest(); //If we were able to get a working active x object, start an XMLHttpRequest
       }
      	//This is the path to the file we just finished making *
   var file = 'city.php?page='; 
	xmlhttp.open('GET', file + page, true); //Open the file through GET, and add the page we want to retrieve as a GET variable **
  xmlhttp.onreadystatechange=function() {
      if (xmlhttp.readyState==4) { //Check if it is ready to recieve data
             var full = xmlhttp.responseText; //The content data which has been retrieved ***
            if( full ){ //Make sure there is something in the content variable
					var fullDemo="<select name='description' class='fieldform'><option readonly>Choose Description</option></select>";
				document.getElementById('full').innerHTML = full; 
					//Change the inner content of your div to the newly retrieved content ****
                }
        }
        }
       xmlhttp.send(null) //Nullify the XMLHttpRequest

return false;

}