var imageBlue = new Image().src = "maps/zoomLevel.gif";
var imageRed = new Image().src = "maps/zoomLevelRed.gif";
var numSave = 8;
var url = "";

function init(){
	var mapScr = document.images["map"].src;
	url = trimString(mapScr);
	url = url.substring(0,(url.length - 1));
}

function trimString(str){
	if (!(str == "")) {
		while(('' + str.charAt(0) == ' ') || ('' + str.charAt(0) == '{')) {
			str=str.substring(1,str.length);
		}
	}
	//take out trailing spaces
	if (!(str == "")) {
		while ((str.charAt(str.length - 1) == ' ') || (str.charAt(str.length - 1) == '}')){
    	str = str.substring(0, str.length - 1);
		}
	}
	return str;
}

function clearLevel(){
	document.images["one"].src 			= imageBlue;
   	document.images["two"].src			= imageBlue;
   	document.images["three"].src 		= imageBlue;
   	document.images["four"].src 		= imageBlue;
   	document.images["five"].src			= imageBlue;
   	document.images["six"].src 			= imageBlue;
   	document.images["seven"].src 		= imageBlue;
   	document.images["eight"].src		= imageBlue;
   	document.images["nine"].src 		= imageBlue;
}

function doLevel(){
	switch (numSave) {
		case (0):
			document.images["one"].src 		= imageRed;
			break;
		case (1):
			document.images["one"].src 		= imageRed;
			break;
		case (2):
			document.images["two"].src		= imageRed;
			break;
		case (3):
			document.images["three"].src 	= imageRed;
			break;
		case (4):
			document.images["four"].src 	= imageRed;
			break;
		case (5):
			document.images["five"].src		= imageRed;
			break;
		case (6):
			document.images["six"].src 		= imageRed;
			break;
		case (7):
			document.images["seven"].src 	= imageRed;
			break;
		case (8):
			document.images["eight"].src	= imageRed;
			break;
		case (9):
			document.images["nine"].src 	= imageRed;
			break;
	}
}

function doZoom(num){
	if (num == 11) {
		if (numSave < 9) {
			numSave += 1;
		} else {
			numSave = 9;
		}
	} else if (num == 0) {
		if (numSave > 1) {
			numSave = numSave - 1;
		} else {
			numSave = 1;
		}
	} else {
		numSave = num;
	}
	// 
	document.images["map"].src="maps/" + numSave + ".gif";
	clearLevel();
	doLevel();
}