// main.js
//
// included in every snapmap page

var searchClicked = false;
var earth_radius = 6378137;
var metres_per_degree = (earth_radius * 2 * Math.PI) / 360;
var SERVER = 'www.snapmap.org'; // this was previously used in ajax calls, but we're now not specifying the domain


function click_search ()
{
	var sb = document.getElementById('searchboxinput');
	if (!searchClicked)
	{
		sb.value = '';
		sb.style.color = 'black';
		searchClicked = true;
	}
}
		
function load ()
{
	/*
	if(typeof thisPageJavaScript == 'function')
		thisPageJavaScript();
	*/
	
	if (typeof scriptname == 'string')
		eval ('load_' + scriptname + '()');
	
	return;
}

// cookie functions (from http://www.quirksmode.org/js/cookies.html)
function createCookie(name,value,days) {
	if (days) {
		var date = new Date();
		date.setTime(date.getTime()+(days*24*60*60*1000));
		var expires = "; expires="+date.toGMTString();
	}
	else var expires = "";
	document.cookie = name+"="+value+expires+"; path=/";
}

function readCookie(name) {
	var nameEQ = name + "=";
	var ca = document.cookie.split(';');
	for(var i=0;i < ca.length;i++) {
		var c = ca[i];
		while (c.charAt(0)==' ') c = c.substring(1,c.length);
		if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
	}
	return null;
}

function eraseCookie(name) {
	createCookie(name,"",-1);
}

// parse an xml string into an xml object (from http://www.w3schools.com/Dom/dom_parser.asp)
function xmlTreeCreate (text)
{
	var xmlDoc;
	if (window.DOMParser)
	{
		var parser=new DOMParser();
		xmlDoc = parser.parseFromString(text, "text/xml");
	}
	else // Internet Explorer
	{
		xmlDoc = new ActiveXObject("Microsoft.XMLDOM");
		xmlDoc.async="false";
		xmlDoc.loadXML(text); 
	}
	return xmlDoc;
}

function deg2rad (angle)
{
    return angle/180*Math.PI;
}

function rad2deg (angle)
{
    return angle/Math.PI*180;
}