// General functions 
// handles ajax calls and hiding, showing, positioning and populating the how to buy div
var IE = document.all?true:false;
function createRequestObject() {
  var ro;
  ro = window.XMLHttpRequest
       ? new XMLHttpRequest() :
         new ActiveXObject("Microsoft.XMLHTTP");
  return ro;
}

var http = createRequestObject();
/**********************************************************************************************************/
function fnHowToBuy(handler){
	if(document.getElementById('flash')){
		document.getElementById('flash').style.display='none';	
	}
	if(IE)
	{ 
		var objects = document.getElementsByTagName("SELECT");
		for(var no=0;no<objects.length;no++)
		{
			  objects[no].style.display = "none";
		}
	}

	var sDate = new Date();
	var sTime = sDate.getMinutes() + '' + sDate.getSeconds() + '' + sDate.getMilliseconds();
	http.open('get', handler+'?time=' + sTime);
	http.onreadystatechange = handleResponseHowToBuy;
	http.send(null);
	return false;
}

function handleResponseHowToBuy() {
	if(http.readyState == 4){
		var response = http.responseText;
		document.getElementById('holdingDiv').innerHTML =response;
		document.getElementById('holdingDiv').style.display = 'block';
		PositionLayer('holdingDiv','large');
		mapLoad(document.getElementById('pcode').innerHTML);//<%=Ucase(rsGall("gallery_postcode"))%>');
	}
}

function fnLoadResults(oForm,handler){
	
	if((oForm.postcode.value =="" || oForm.postcode.value =="Enter Postcode") && (oForm.town.value =="" || oForm.town.value =="Enter Town") ){
		alert("Please enter a postcode or town");
		return false;
	}else{
		var sSearch
		if(oForm.postcode.value !="" && oForm.postcode.value !="Enter Postcode"){
		sSearch = "?Postcode="+oForm.postcode.value;	
		}else{
			sSearch = "?Postcode="+oForm.town.value;
		}
		var sDate = new Date();
		var sTime = sDate.getMinutes() + '' + sDate.getSeconds() + '' + sDate.getMilliseconds();
		http.open('get', handler+sSearch+'&time=' + sTime);
		http.onreadystatechange = handleResponseHowToBuy;
		http.send(null);
		return false;
	}
}


function fnLoadLocation(handler){
	var sDate = new Date();
	var sTime = sDate.getMinutes() + '' + sDate.getSeconds() + '' + sDate.getMilliseconds();
	http.open('get', handler+'&time=' + sTime);
	http.onreadystatechange = handleResponseHowToBuy;
	http.send(null);
	return false;
}

/**********************************************************************************************************/
function PositionLayer(layerName, size)
{	
	if(size == 'large'){
		
		var nTop = 135;
		var framewidth = '565px';
		var nLeft = 282;
	}else{
		
		var nTop = 62;
		var framewidth = '265px';
		var nLeft = 132;
	}
	
	var IE = document.all?true:false;
	if(navigator.userAgent.indexOf('Netscape/7.0') != -1) var ns7 = true;
	layer = document.getElementById(layerName);
	
	document.getElementById("alert").style.width = framewidth;
	
	if(IE)
	{ 
		layer.style.top = (document.documentElement.clientHeight / 2) - nTop;
		layer.style.left = ( document.body.clientWidth / 2 ) - nLeft;
	}
	else
	{
		var newTop = ( window.innerHeight / 2) - nTop;
		var newLeft = ( document.body.clientWidth / 2 ) - nLeft;
		newTop += 'px';
		newLeft += 'px';
		layer.style.top = newTop;
		layer.style.left = newLeft;
	}
	if(ns7)
	{			
		sNetscapeLeft = (window.innerWidth / 2) - nLeft + 'px';
		sNetscapeTop = window.pageYOffset + 300 + 'px';
		layer.style.left = sNetscapeLeft;
		layer.style.top = sNetscapeTop;
	}
	if(navigator.userAgent.indexOf('MSIE 5.5') != -1) 
	{
		sIE5Left = (document.body.clientWidth / 2) - nLeft + 'px';
		layer.style.left = sIE5Left;
	}
	
	/*
	if (document.getElementById('errorFrame')) {
		
		frame = document.getElementById('errorFrame'); // find iFrame to position behind layer to fix selects breaking layer.
	
		if(layerName == 'holdingDiv')
		{
			var errorFrameTop = layer.style.top.substring(0, layer.style.top.indexOf('px')) - 0;
			var errorFrameLeft = layer.style.left.substring(0, layer.style.left.indexOf('px')) - 0;
			if(document.getElementById('alert'))
			{
				var errorFrameHeight = document.getElementById('alert').clientHeight - 0;
				errorFrameHeight = 300;
			}
			else
			{
				var errorFrameHeight = 120;
			}
			frame.style.top = errorFrameTop+5;
			frame.style.left = errorFrameLeft+5;
			frame.style.width = framewidth;//'265px';
			frame.style.height = errorFrameHeight - 19;
			frame.style.display = "block";
			frame.style.filter='progid:DXImageTransform.Microsoft.Alpha(style=0,opacity=0)';
		}
		else
		{
		}
	}
	*/
	
	
	
}

function hideLayer(layerName)
{
	document.getElementById(layerName).style.display = 'none';
	if(document.getElementById('errorFrame')) document.getElementById('errorFrame').style.display = 'none';
	if(document.getElementById('flash')){
		document.getElementById('flash').style.display='block';	
	}
	if(IE)
	{ 
		var objects = document.getElementsByTagName("SELECT");
		for(var no=0;no<objects.length;no++)
		{
			  objects[no].style.display = "block";
		}
	}
}