var boolRool = false;
//browser checking
var browsername=navigator.appName;
var platform;
if (browsername.indexOf("Netscape")!=-1) {browsername="NS"}
else
{if (browsername.indexOf("Microsoft")!=-1) {browsername="MSIE"
	browserversion="0";
	platform="";
	if (navigator.appVersion.indexOf("2.")!=-1) {browserversion="2"};
	if (navigator.appVersion.indexOf("3.")!=-1) {browserversion="3"};
	if (navigator.appVersion.indexOf("4.")!=-1) {browserversion="4"};
	if (navigator.appVersion.indexOf("5.")!=-1) {browserversion="5"};
	if (navigator.platform.indexOf("Win32")!=-1) {platform="Win32"};
	if (navigator.platform.indexOf("Mac")!=-1) {platform="Mac"};

}
else {browsername="N/A"}};
//end of browser checking

function MM_findObj(n, d) { //v4.0
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length)
{
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++)
x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++)
x=MM_findObj(n,d.layers[i].document);
  if(!x && document.getElementById) x=document.getElementById(n); return x;
}

function MM_swapImgRestore() { //v3.0
  var i,x,a=document.MM_sr; for(i=0;a&&i<a.length&&(x=a[i])&&x.oSrc;i++)
x.src=x.oSrc;
}

function MM_preloadImages() { //v3.0
  var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
    var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length;
i++)
    if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}

function MM_swapImage() { //v3.0
  var i,j=0,x,a=MM_swapImage.arguments; document.MM_sr=new Array; for(i=0;i<(a.length-2);i+=3)
   if ((x=MM_findObj(a[i]))!=null){document.MM_sr[j++]=x; if(!x.oSrc) x.oSrc=x.src; x.src=a[i+2];}
}

//load the highlight image for the current menu
function selectImageMenu(imageName){
//load the menu image
MM_preloadImages('')

	switch (imageName)
		{
		case "t1" :
			document.tab1.src = 'img/tab_sewage_o.gif'
			break;
		case "t2" :
			document.tab2.src = 'img/tab_intruments_o.gif'
			break;
		case "t3" :
			document.tab3.src = 'img/tab_valves_o.gif'
			break;
		case "t4" :
			document.tab4.src = 'img/tab_piping_o.gif'
			break;
		case "t5" :
			document.tab5.src = 'img/tab_filters_o.gif'
			break;
		case "t6" :
			document.tab6.src = 'img/tab_safety_o.gif'
			break;
		case "t7" :
			document.tab7.src = 'img/tab_valve_o.gif'
			break;

		}
		//allow the rool over
		boolRool = true;
}