function change (picurl) {
document.home1.src = picurl;
}

function bahrain () {window.open("bahrain.html", "jstest", "height=388,width=781,channelmode=0,dependent=0,dir ectories=0,fullscreen=0,location=0,menubar=0,resiz able=0,scrollbars=0,status=0,toolbar=0");};


function ShowHide(id) {    obj = document.getElementsByTagName("div");    if (obj[id].style.visibility == 'visible'){    obj[id].style.visibility = 'hidden';    }    else {    obj[id].style.visibility = 'visible';    }}var step = 5;var delay = 50;

function fadeImageIn (img) {  if (document.all || navigator.appName == 'Netscape' && parseFloat(navigator.appVersion) >= 5) {    img.opacity = 0;    setOpacity(img.name);  }}

function setOpacity (imgName, step, delay) {  if (!step)    step = window.step;  if (!delay)    delay = window.delay;  var img = document.images[imgName];  img.opacity += step;  if (document.all)    img.style.filter = 'alpha(opacity = ' + img.opacity + ')';  else if (navigator.appName == 'Netscape' &&parseFloat(navigator.appVersion) >= 5)    img.style.MozOpacity = img.opacity + '%';  if (step > 0 && img.opacity < 99 || step < 0 && img.opacity > 0)    setTimeout('setOpacity("' + img.name + '",' + step + ', ' + delay + ')', delay);}



/***********************************************
* AnyLink Drop Down Menu- © Dynamic Drive (www.dynamicdrive.com)
* This notice MUST stay intact for legal use
* Visit http://www.dynamicdrive.com/ for full source code
***********************************************/

//Contents for menu 1
var menu1=new Array()
menu1[0]='<a href="about.html">The Organisation</a>'
menu1[1]='<a href="expertise.html">Expertise</a>'
menu1[2]='<a href="experience.html">Experience</a>'
menu1[3]='<a href="staff.html">Staff</a>'
menu1[4]='<a href="clients.html">Our Clients</a>'

//Contents for menu 2, and so on
var menu2=new Array()
menu2[0]='<a href="architecturalacoustics.html">Architectural Acoustics</a>'
menu2[1]='<a href="buildingservices.html">Building Services Noise & Vibration Control</a>'
menu2[2]='<a href="environmentalacoustics.html">Noise & Vibration Surveys/Monitoring</a>'
menu2[3]='<a href="noiseimpactassessments.html">Planning & Noise Impact Assessments</a>'
menu2[4]='<a href="soundinsulationtesting.html">Sound Insulation Testing</a>'
menu2[5]='<a href="airpressuretesting.html">NEW! Air Pressure Testing</a>'
menu2[6]='<a href="demolitionconstruction.html">Demolition/Construction Noise & Vibration</a>'
menu2[7]='<a href="noisemapping.html">Noise Mapping</a>'
menu2[8]='<a href="roomacousticmodelling.html">Room Acoustic Modelling</a>'
menu2[9]='<a href="noiseatwork.html">Noise at Work Assessments</a>'
menu2[10]='<a href="handarmvibration.html">Hand & Arm Vibration Assessments</a>'
menu2[11]='<a href="legal.html">Expert Witness & Legal</a>'
menu2[12]='<a href="monitoring-equipment-hire.html">NEW! Monitoring Equipment Hire</a>'

//Contents for menu 3, and so on
var menu3=new Array()

menu3[0]='<a href="office.html">Office & Commercial</a>'
menu3[1]='<a href="residential.html">Residential & Hotel</a>'
menu3[2]='<a href="leisureretail.html">Leisure, Retail & Mixed Use</a>'
menu3[3]='<a href="performingarts.html">Performing Arts</a>'
menu3[4]='<a href="education.html">Education</a>'
menu3[5]='<a href="health.html">Health</a>'
menu3[6]='<a href="industrial.html">Industrial</a>'
menu3[7]='<a href="environmental.html">Environmental</a>'
menu3[8]='<a href="offshore.html">Offshore</a>'
menu3[9]='<a href="international.html">International Developments</a>'

//Contents for menu 4, and so on
var menu4=new Array()
menu4[0]='<a href="contact.html">London (Head) Office : Woking</a>'
menu4[1]='<a href="manchester.html">Northern Office : Manchester</a>'
	
var menuwidth='110px' //default menu width
var menubgcolor='white'  //menu bgcolor
var disappeardelay=250  //menu disappear speed onMouseout (in miliseconds)
var hidemenu_onclick="yes" //hide menu when user clicks within menu?

/////No further editting needed

var ie4=document.all
var ns6=document.getElementById&&!document.all

if (ie4||ns6)
document.write('<div id="dropmenudiv" style="visibility:hidden;width:'+menuwidth+';background-color:'+menubgcolor+'" onMouseover="clearhidemenu()" onMouseout="dynamichide(event)"></div>')

function getposOffset(what, offsettype){
var totaloffset=(offsettype=="left")? what.offsetLeft : what.offsetTop;
var parentEl=what.offsetParent;
while (parentEl!=null){
totaloffset=(offsettype=="left")? totaloffset+parentEl.offsetLeft : totaloffset+parentEl.offsetTop;
parentEl=parentEl.offsetParent;
}
return totaloffset;
}


function showhide(obj, e, visible, hidden, menuwidth){
if (ie4||ns6)
dropmenuobj.style.left=dropmenuobj.style.top="-500px"
if (menuwidth!=""){
dropmenuobj.widthobj=dropmenuobj.style
dropmenuobj.widthobj.width=menuwidth
}
if (e.type=="click" && obj.visibility==hidden || e.type=="mouseover")
obj.visibility=visible
else if (e.type=="click")
obj.visibility=hidden
}

function iecompattest(){
return (document.compatMode && document.compatMode!="BackCompat")? document.documentElement : document.body
}

function clearbrowseredge(obj, whichedge){
var edgeoffset=0
if (whichedge=="rightedge"){
var windowedge=ie4 && !window.opera? iecompattest().scrollLeft+iecompattest().clientWidth-15 : window.pageXOffset+window.innerWidth-15
dropmenuobj.contentmeasure=dropmenuobj.offsetWidth
if (windowedge-dropmenuobj.x < dropmenuobj.contentmeasure)
edgeoffset=dropmenuobj.contentmeasure-obj.offsetWidth
}
else{
var topedge=ie4 && !window.opera? iecompattest().scrollTop : window.pageYOffset
var windowedge=ie4 && !window.opera? iecompattest().scrollTop+iecompattest().clientHeight-15 : window.pageYOffset+window.innerHeight-18
dropmenuobj.contentmeasure=dropmenuobj.offsetHeight
if (windowedge-dropmenuobj.y < dropmenuobj.contentmeasure){ //move up?
edgeoffset=dropmenuobj.contentmeasure+obj.offsetHeight
if ((dropmenuobj.y-topedge)<dropmenuobj.contentmeasure) //up no good either?
edgeoffset=dropmenuobj.y+obj.offsetHeight-topedge
}
}
return edgeoffset
}

function populatemenu(what){
if (ie4||ns6)
dropmenuobj.innerHTML=what.join("")
}


function dropdownmenu(obj, e, menucontents, menuwidth){
if (window.event) event.cancelBubble=true
else if (e.stopPropagation) e.stopPropagation()
clearhidemenu()
dropmenuobj=document.getElementById? document.getElementById("dropmenudiv") : dropmenudiv
populatemenu(menucontents)

if (ie4||ns6){
showhide(dropmenuobj.style, e, "visible", "hidden", menuwidth)
dropmenuobj.x=getposOffset(obj, "left")
dropmenuobj.y=getposOffset(obj, "top")
dropmenuobj.style.left=dropmenuobj.x-clearbrowseredge(obj, "rightedge")+"px"
dropmenuobj.style.top=dropmenuobj.y-clearbrowseredge(obj, "bottomedge")+obj.offsetHeight+"px"
}

return clickreturnvalue()
}

function clickreturnvalue(){
if (ie4||ns6) return false
else return true
}

function contains_ns6(a, b) {
while (b.parentNode)
if ((b = b.parentNode) == a)
return true;
return false;
}

function dynamichide(e){
if (ie4&&!dropmenuobj.contains(e.toElement))
delayhidemenu()
else if (ns6&&e.currentTarget!= e.relatedTarget&& !contains_ns6(e.currentTarget, e.relatedTarget))
delayhidemenu()
}

function hidemenu(e){
if (typeof dropmenuobj!="undefined"){
if (ie4||ns6)
dropmenuobj.style.visibility="hidden"
}
}

function delayhidemenu(){
if (ie4||ns6)
delayhide=setTimeout("hidemenu()",disappeardelay)
}

function clearhidemenu(){
if (typeof delayhide!="undefined")
clearTimeout(delayhide)
}

if (hidemenu_onclick=="yes")
document.onclick=hidemenu