var offset = 0;

function getHTTPObject()
{
	var xmlhttp;
	/*@cc_on
	@if(@_jscript_version >=5)
	try
	{
		xmlhttp=new ActiveXObject("Msxml2.XMLHTTP");
	}
	catch(e)
	{
		try
		{
			xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
		}
		catch(E)
		{
			xmlhttp=false;
		}
	}
	@else
		xmlhttp=false;
	@end @*/
	if(!xmlhttp && typeof XMLHttpRequest != 'undefined')
	{
		try
		{
			xmlhttp=new XMLHttpRequest();
		}
		catch(e)
		{
			xmlhttp=false;
		}
	}
	return xmlhttp;
}
function handleToggleResponse()
{
	if(http.readyState == 4)
	{
		//alert(http.responseText);
		var fieldid = 'toggle_' + offset;
		document.getElementById(fieldid).innerHTML=http.responseText;	
	}
}
function toggleStatus(id,item)
{
	offset = id;
	var url = 'togglestatus.php?item=' + item;
	//alert(url);
	http.open("GET",url, true);
	http.onreadystatechange = handleToggleResponse;
	http.send(null);
} 
function handleEmailResponse()
{
	if(http.readyState == 4)
	{
//		alert(http.responseText);
		document.getElementById('emailvalid').innerHTML=http.responseText;	
	}
}
function emailValid(field)
{
	emailaddr = field.value;
	if(emailaddr == '' || emailaddr == 0) return;
	var url = 'checkemail.php?addr=' + emailaddr;
	//alert(url);
	http.open("GET",url, true);
	http.onreadystatechange = handleEmailResponse;
	http.send(null);
} 
function handleNameResponse()
{
	if(http.readyState == 4)
	{
//		alert(http.responseText);
		document.getElementById('namevalid').innerHTML=http.responseText;	
		if(http.responseText.length > 5)
			document.getElementById('subbut').disabled=true;
		else
			document.getElementById('subbut').disabled=false;
	}
}
function checkName(field)
{
	var fname = document.form.fname.value;
	var lname = document.form.lname.value;
	if(fname == '' || lname == '') return;
	var url = 'checkname.php?fname=' + fname + '&lname=' + lname;
	//alert(url);
	http.open("GET",url, true);
	http.onreadystatechange = handleNameResponse;
	http.send(null);
} 
function handleStudentResponse()
{
	if(http.readyState == 4)
	{
//		alert(http.responseText);
		document.getElementById('childid').innerHTML=http.responseText;	
	}
}
function getStudents(selelm)
{
	var room = selelm.options[selelm.selectedIndex].value;
	var url = 'getstudents.php?room=' + room;
//	alert(url);
	http.open("GET",url, true);
	http.onreadystatechange = handleStudentResponse;
	http.send(null);
} 
function handlevcflist()
{
	if(http.readyState == 4)
	{
//		alert(http.responseText);
      ddrivetip(http.responseText,'')
	}
}
function getvcflist(vcfid)
{
	var url = 'getfilelist.php?vcf=' + vcfid;
//	alert(url);
	http.open("GET",url, true);
	http.onreadystatechange = handlevcflist;
	http.send(null);
}