function setOpacity(value) {
	var overlayImg = document.getElementById('overlayImg');
	overlayImg.style.opacity = value/10;
	overlayImg.style.filter = 'alpha(opacity=' + value*10 + ')';
}

function hideOverlayImg() {
	window.clearInterval(checkTimeout);
	checkTimeout="";
	var overlayImg = document.getElementById('overlayImg');
	if (document.layers){ overlayImg.style.visibility = 'hide';
	}else{ overlayImg.style.visibility = 'hidden'; }
}

function locateOverlayImg(targetTitle) {
	// Set the location of the "loading..." overlay image directly over the layer image
	var overlayImg = document.getElementById('overlayImg');
	overlayOffset = 0;
	//if(document.all) { overlayOffset = 6; }
	var layerImg = document.getElementById(targetTitle);
	overlayImg.style.left = (findPosX(layerImg)+overlayOffset)+'px';
	overlayImg.style.top = (findPosY(layerImg)+overlayOffset)+'px';
}

function downloadFileCheck(dnForm) {
	dType = "";
	for (i=0; i<dnForm.downloadType.length; i++){
		if(dnForm.downloadType[i].checked) {
			dType = dnForm.downloadType[i].value;
		}
	}
	if(!dType) {
		alert("Download type required!");
		dnForm.downloadType[0].focus();
		return;
	}
	dnForm.L_ID.value = displayLayer_MUD;
	dnForm.submit();
	//downloadURL = "/downloadOneLayer.php?L_ID="+displayLayer_MUD+"&DTYPE="+dType;
	//frames['hiddenFrame'].location.href = 'downloadPost.html?downloadURL='+escape(downloadURL);

}

function updateZoneTable(numZones) {
	zoneData = document.getElementById('downloadZoneData');
	downloadForm = document.getElementById('download');
	zoneHTML = "";
	if(numZones>0){
		zoneHTML = projSelect;
//		if((downloadForm.DTYPE[0].checked)||
//			(downloadForm.DTYPE[2].checked)){ zoneHTML = projSelect; }
		if((downloadForm.DTYPE[1].checked)||
			(downloadForm.DTYPE[2].checked)){
			zoneHTML += "Enter zone rates:<br>";
			for (i=1; i<=numZones; i++){
				zoneColor = zoneColors[Math.floor((i-1)*numZoneColors/numZones)];
				zoneHTML += "Zone "+i+"&nbsp;<span style='background-color: "+zoneColor+"; border: 1px solid gray;'>&nbsp;</span> <input type='text' id='MAP[]' name='MAP[]' size='4' maxLength='4' /><br>";
			}
		}
	} else {
		zoneHTML = '<input type="hidden" id="PROJ" name="PROJ" value="'+(downloadForm.DTYPE[0].checked?"2163":"4326")+'">';
	}
	zoneData.innerHTML = zoneHTML;
	//if(downloadForm.DTYPE[2].checked){ document.getElementById('PROJ').value = 4326; }
}

function uploadFileCheck(upForm) {
	if(!upForm.newLayerName.value) {
		alert("Layer name required!");
		upForm.newLayerName.focus();
		return;
	}
	if(!upForm.newLayer.value) {
		alert("Please click 'Browse' to select a file!");
		upForm.newLayer.focus();
		return;
	}
	showOverlayImage('manageUserData', 'userselectPic');
	upForm.submit();
	upForm.newLayerName.value = "";
}

var startTime;
var checkTimeout;
function showOverlayImage(formId, picTitle) {
	var overlayImg = document.getElementById('overlayImg');
	var targetForm = document.getElementById(formId);
	overlayImg.width = targetForm.offsetWidth;
	overlayImg.height = targetForm.offsetHeight;
	locateOverlayImg(formId);
	var layerImg = document.getElementById(picTitle);
	layerImg.onload = hideOverlayImg;
	layerImg.onabort = hideOverlayImg;
	layerImg.onerror = hideOverlayImg;
	// Set timeout for loading of overlay image
	startTime = new Date();
	if(picTitle=='userselectPic'){
		if((checkTimeout=="")||(checkTimeout==null)){
			checkTimeout = window.setInterval("checkOverlayImage()", 5000);
		}
	}
	if (document.layers){ overlayImg.style.visibility = 'show';
	}else{ overlayImg.style.visibility = 'visible'; }
	setOpacity(4);
}

function checkOverlayImage(){
	if((new Date()-startTime)>5000){
		alert("Loading of image failed.");
		hideOverlayImg();
		window.clearInterval(checkTimeout);
		checkTimeout="";
	}
}

function br2nl(txtDescr){
	return(txtDescr.replace(/<\/?[^>]+(>|$)/g, "\n"));
} 

function newSensor(sensorName) {
	document.getElementById('DNGPList').innerHTML = sensorList+"<br>"+DNGPLists[sensorName];
	document.getElementById('sensors').value = sensorName;
	document.getElementById('DNGP').options[0].text = "--Select "+sensorName+" Image--";
}

function newUserLayer(idx, val, picTitle, picTitleId, imgType, formId) {
	var layerImg = document.getElementById(picTitle);
	showOverlayImage(formId, picTitle);
	switch (imgType) {
		case "image":
			getOneURL = '/getOneImage.php?ID='+idx;
			frames['hiddenFrame'].location.href = 'getOneImage.html?max='+IMG_DIM+'&pic='+picTitle+'&go_url='+escape(getOneURL);
			displayType = "DNGP";
			document.getElementById('saveClassification').style.display = "none";
			classifyImage = '';
			break;
		case "layer":
			getOneURL = '/getOneLayer.php?L_ID='+idx;
			frames['hiddenFrame2'].location.href = 'getOneLayer.html?max='+IMG_DIM+'&pic='+picTitle+'&go_url='+escape(getOneURL);
			displayType = "User";
			if(picTitle == "selectPic") {
				document.getElementById('saveClassification').style.display = "none";
				classifyImage = '';
			}
			break;
		case "classify":
			layerImg.src=classifyImage;
			break;
		default:
			layerImg.src=EMPTY_LAYER_IMG;
	}
	document.getElementById(picTitleId).innerHTML=val;
	if(formId=='manageUserData') {
		document.getElementById('classTxt').value = br2nl(layerDescr[idx]);
		displayLayer_MUD = idx;
		displayLayerName_MUD = val;
	} else {
		displayLayer = idx;
		displayLayerName = val;
		displayLayerType = imgType;
		document.getElementById('to').disabled = false;
	}
}