function initMap() {
	var x = (document.getElementById('map')).getElementsByTagName('img');
	for(var i=0; i<x.length; i++) {
		x[i].onmouseover = showsummary;
		x[i].onmouseout  = hidesummary;
		x[i].style.left = x[i].getAttribute('left')+'px';
		x[i].style.top = x[i].getAttribute('top')+'px';
		
	}
}

function showsummary() {
	this.src = 'images/reddot.gif';
	(document.getElementById('conditions')).innerHTML =
		(document.getElementById('w_'+this.getAttribute('station'))).innerHTML;
	(document.getElementById('cityname')).innerHTML =
		(document.getElementById('z_'+this.getAttribute('zip'))).innerHTML;
	(document.getElementById('extended')).innerHTML =
		(document.getElementById('x_'+this.getAttribute('zip'))).innerHTML;
}

function hidesummary() {
	this.src = 'images/smalldot.gif';
}