function getXMLHTTP() { //fuction to return the xml http object
			 var httprequest=false
			  if (window.XMLHttpRequest) { 
			    httprequest = new XMLHttpRequest();
			    if (httprequest.overrideMimeType) {
			      httprequest.overrideMimeType('text/xml; charset=iso-8859-9')
			    }
			  } else if (window.ActiveXObject) { 
			    try {
			      httprequest = new ActiveXObject("Msxml2.XMLHTTP");
			    } catch (e) {
			      try {
			        httprequest = new ActiveXObject("Microsoft.XMLHTTP");
			      } catch (e) {
				      try {
				        httprequest = new ActiveXObject("MSXML2.XMLHTTP.3.0");
				      } catch (e) {
				      }	  
			      }
			    }
			  }
			  return httprequest;
		}