function Is ()
{  //convert all characters to lowercase to simplify testing
   var agt=navigator.userAgent.toLowerCase()

   // *** Browser Version ***
   this.major = parseInt(navigator.appVersion)

   this.nav = ((agt.indexOf('mozilla')!=-1) && ((agt.indexOf('spoofer')==-1) && (agt.indexOf('compatible')==-1)))
   this.nav4 = (this.nav &&(this.major == 4))
   this.nav4up = (this.nav &&(this.major >= 4))

   this.ie = (agt.indexOf("msie")!=-1)
   this.ie4 = (this.nav &&(this.major == 4))
   this.ie4up = (this.nav &&(this.major >= 4))
}

var is = new Is();

function makeItVisible(id,event)
{
   if (is.nav4up) {
      document.layers[id].left = 215;
      document.layers[id].top = 370;
      document.layers[id].visibility="show";
   }
   else {
      document.all[id].style.pixelLeft = 215;
      document.all[id].style.pixelTop = 370;
      document.all[id].style.visibility="visible";
   }
}

function hidePopUp(id)
{
   is.nav4up ? document.layers[id].visibility="hide" : document.all[id].style.visibility="hidden";
}

if (document.images) {
	topnav1_n = new Image	
	topnav1_r = new Image
    topnav2_n = new Image
	topnav2_r = new Image
	topnav3_n = new Image
	topnav3_r = new Image	
	topnav4_n = new Image
    topnav4_r = new Image
	topnav5_n = new Image
	topnav5_r = new Image	
	topnav6_n = new Image
    topnav6_r = new Image
	topnav7_n = new Image
    topnav7_r = new Image
	topnav8_n = new Image
    topnav8_r = new Image
	next_n = new Image
    next_r = new Image
	    
	topnav1_n.src = 'images/top_nav_1.gif'	
    topnav1_r.src = 'images/top_nav_1r.gif'
	topnav2_n.src = 'images/top_nav_2.gif'	
    topnav2_r.src = 'images/top_nav_2r.gif'
	topnav3_n.src = 'images/top_nav_3.gif'
	topnav3_r.src = 'images/top_nav_3r.gif'	
    topnav4_n.src = 'images/top_nav_4.gif'
	topnav4_r.src = 'images/top_nav_4r.gif'
	topnav5_n.src = 'images/top_nav_5.gif' 
	topnav5_r.src = 'images/top_nav_5r.gif'	
    topnav6_n.src = 'images/top_nav_6.gif'
	topnav6_r.src = 'images/top_nav_6r.gif'
	topnav7_n.src = 'images/top_nav_7.gif'
	topnav7_r.src = 'images/top_nav_7r.gif'
	topnav8_n.src = 'images/top_nav_8.gif'
	topnav8_r.src = 'images/top_nav_8r.gif'
	next_n.src = 'images/but_next.gif'
	next_r.src = 'images/but_nextr.gif'
	
}
else {
	topnav1_n = ""	
	topnav1_r = ""
    topnav2_n = ""
	topnav2_r = ""
	topnav3_n = ""
	topnav3_r = ""	
	topnav4_n = ""
    topnav4_r = ""
	topnav5_n = ""
	topnav5_r = ""	
	topnav6_n = ""
    topnav6_r = ""
	topnav7_n = ""
    topnav7_r = ""
	topnav8_n = ""
    topnav8_r = ""
	next_n = ""
    next_r = ""

}

//////***************Drop-Down Menu code**********************

var menuTop = 45;
var menuLeft = 400;

var domSMenu = null;
var oldDomSMenu = null;
var t = 0;
var lDelay = 3;
var lCount = 0;
var pause = 100;

function popMenu(menuNum){
	if (isDHTML) {
///// Sets the previous menu's visibility to hidden
		t = 2;
		if (oldDomSMenu) {
			oldDomSMenu.visibility = 'hidden'; 
			oldDomSMenu.zIndex = '0'; 
			t = 2; 
			lCount = 0;
		}

///// Defines the DOMs	of the menu objects
		var idMenu = 'menuHead';
		var domMenu = findDOM(idMenu,0);

		var idMenuOpt = 'menuHead' + menuNum;
		var domMenuOpt = findDOM(idMenuOpt,0);		

		var idSMenu = 'menu' + menuNum;
		var domSMenu = findDOM(idSMenu,1);

///// Defines the positions of the sub-menus
	if (isID || isAll) { 	
				var menuLeft = (domMenu.offsetLeft) + (domMenuOpt.offsetLeft) + 396;
				var menuTop = (domMenu.offsetTop) + (domMenu.offsetHeight) - 8;
			}
		if (isLayers) {
				var menuLeft = document.layers[idMenu].layers[idMenuOpt].pageX - 5;
				var menuTop = domMenu.pageY + domMenu.clip.height - 5;
		}

///// Positions and shows the menu
		if (oldDomSMenu != domSMenu) {	
			domSMenu.left = menuLeft; 
			domSMenu.top = menuTop;
			domSMenu.visibility = 'visible';
			domSMenu.zIndex = '100';
			oldDomSMenu = domSMenu;
		}

///// Resets oldDom if it is the same as the current DOM
		else { oldDomSMenu = null; }
	}

////// Returns a 'null' value for non-DHTML Browsers 
	else { return null; }
}

function delayHide() {
///// Checks to see if there is a menu showing and whether 
///// the global variable 't' has been set to 0
    if ((oldDomSMenu) && (t == 0)) {

///// Hides the old menu, resets menu conditions, 
///// and stops the function running
        oldDomSMenu.visibility = 'hidden'; 
        oldDomSMenu.zIndex = '0';
        oldDomSMenu = null;
        lCount = 0; 
        return false;
    }

///// Interupts the function if another menu is opened
    if (t == 2) { lCount = 0; return false; }

///// Repeats the function adding 1 to lCount each time until 
///// lCount is equal to lDelay and then sets 't' to 0 so that 
///// the menu will hide when it runs again
    if (t == 1) { 
        lCount = lCount + 1;
        if (lDelay <= lCount) { t = 0; }
        if (lDelay >= lCount) { setTimeout('delayHide(' + t + ')',pause); }
    }
}