var xmlHttp

function showWorkSites(str)
{
	//alert ("dada");
	if (str.length==0)
	{ 
	document.getElementById("teachers_div").innerHTML=""
	return
	}
	document.getElementById("teachers_div").innerHTML="please wait ..."
	xmlHttp=GetXmlHttpObject()
	if (xmlHttp==null)
	{
	alert ("Browser does not support HTTP Request,Please use Mozilla Firefox or Internet Explorer.")
	return
	}
	var url="get_work_sites.php"
	url=url+"?q="+str
	xmlHttp.onreadystatechange=stateChanged 
	xmlHttp.open("GET",url,true)
	xmlHttp.send(null)
} 

function stateChanged() 
{ 
	if (xmlHttp.readyState==4 || xmlHttp.readyState=="complete")
	{ 
	document.getElementById("teachers_div").innerHTML=xmlHttp.responseText 
	} 
} 

function GetXmlHttpObject()
{ 
	var objXMLHttp=null
	if (window.XMLHttpRequest)
	{
	objXMLHttp=new XMLHttpRequest()
	}
	else if (window.ActiveXObject)
	{
	objXMLHttp=new ActiveXObject("Microsoft.XMLHTTP")
	}
	return objXMLHttp
}