function loadMap() {
    if (GBrowserIsCompatible()) {
        var map = new GMap2(document.getElementById("map"));
        map.addControl(new GSmallMapControl());
        map.setCenter(new GLatLng(51.533, -0.096), 14);
        var marker = new GMarker(new GLatLng(51.5385, -0.0858));
        map.addOverlay(marker);
    }
}

function pdfOpenWindow() {
    var pdfLink = document.getElementById("directionspdf"); 
    pdfLink.target = "_blank";
}

function toggleBlind() {
	var toggle = document.getElementById("toggle");
	toggle.style.backgroundImage = "url('../images/down_arrow.png')";
	toggle.onclick = function() {
		currBg = this.style.backgroundImage.toString();
		if (currBg == "url(../images/down_arrow.png)"){
			this.style.backgroundImage = "url('../images/up_arrow.png')";
		} else {
			this.style.backgroundImage = "url('../images/down_arrow.png')";
		}
		return false;
    }
}

function openCaseStudy() {
	var div1 = document.getElementById('container')
	//var div2 = document.getElementById('casestudy_link')
	div1.style.top = "auto";
	div1.style.display = "block";
	//div2.style.display = "none";	
}

function closeCaseStudy() {
	var div1 = document.getElementById('container')
	//var div2 = document.getElementById('casestudy_link')	
	div1.style.display = "none";
	//div2.style.display = "block";	
}

<!-- Hide from old browsers

var imagenumber = 42 ;
var randomnumber = Math.random() ;
var rand1 = Math.round( (imagenumber-1) * randomnumber) + 1 ;
images = new Array
images[1] = "images/bg_home.jpg"
images[2] = "images/bg_home2.jpg"
images[3] = "images/bg_home3.jpg"
images[4] = "images/bg_home4.jpg"
var image = images[rand1]
// -- End Hiding Here -->