function Is() {
	var agent = navigator.userAgent.toLowerCase();
	this.major = parseInt(navigator.appVersion);
	this.minor = parseFloat(navigator.appVersion);
	this.ns = ((agent.indexOf('mozilla') != -1) && (agent.indexOf('spoofer') == -1) && (agent.indexOf('compatible') == -1) && (agent.indexOf('opera') == -1) && (agent.indexOf('webtv') == -1));
	this.ns2 = (this.ns && (this.major == 2));
	this.ns3 = (this.ns && (this.major == 3));
	this.ns4 = (this.ns && (this.major == 4));
	this.ns6 = (this.ns && (this.major >= 5));
	this.ie = (agent.indexOf("msie") != -1);
	this.ie3 = (this.ie && (this.major < 4));
	this.ie4 = (this.ie && (this.major == 4) && (agent.indexOf("msie 5") == -1));
	this.ie5 = (this.ie && (this.major == 4) && (agent.indexOf("msie 5") != -1));
	this.ieX = (this.ie && !this.ie3 && !this.ie4);
	this.op3 = (agent.indexOf("opera") != -1);
	this.win = (agent.indexOf("win")!=-1);
	this.mac = (agent.indexOf("mac")!=-1);
	this.unix = (agent.indexOf("x11")!=-1);
}
	var is = new Is(); // Create a browser detection object

	
//show drop functions

function showDrop1(){
if(is.ns6){
document.getElementById('sub1').style.visibility = 'visible';
document.getElementById('subtop1').style.visibility = 'visible';
}
if(is.ns4){
document.layers['sub1'].visibility = 'show';
document.layers['subtop1'].visibility = 'show';
document.layers['sub2'].visibility = 'hide';
document.layers['subtop2'].visibility = 'hide';
document.layers['sub3'].visibility = 'hide';
document.layers['subtop3'].visibility = 'hide';
document.layers['sub4'].visibility = 'hide';
document.layers['subtop4'].visibility = 'hide';
document.layers['sub5'].visibility = 'hide';
document.layers['subtop5'].visibility = 'hide';
document.layers['sub6'].visibility = 'hide';
document.layers['subtop6'].visibility = 'hide';
}
if(is.ie){
document.all.sub1.style.visibility = 'visible';
document.all.subtop1.style.visibility = 'visible';
}
}

function showDrop2(){
if(is.ns6){
document.getElementById('sub2').style.visibility = 'visible';
document.getElementById('subtop2').style.visibility = 'visible';
}
if(is.ns4){
document.layers['sub1'].visibility = 'hide';
document.layers['subtop1'].visibility = 'hide';
document.layers['sub2'].visibility  = 'show';
document.layers['subtop2'].visibility  = 'show';
document.layers['sub3'].visibility = 'hide';
document.layers['subtop3'].visibility = 'hide';
document.layers['sub4'].visibility = 'hide';
document.layers['subtop4'].visibility = 'hide';
document.layers['sub5'].visibility = 'hide';
document.layers['subtop5'].visibility = 'hide';
document.layers['sub6'].visibility = 'hide';
document.layers['subtop6'].visibility = 'hide';
}
if(is.ie){
document.all.sub2.style.visibility = 'visible';
document.all.subtop2.style.visibility = 'visible';
}
}

function showDrop3(){
if(is.ns6){
document.getElementById('sub3').style.visibility = 'visible';
document.getElementById('subtop3').style.visibility = 'visible';
}
if(is.ns4){
document.layers['sub1'].visibility = 'hide';
document.layers['subtop1'].visibility = 'hide';
document.layers['sub2'].visibility = 'hide';
document.layers['subtop2'].visibility = 'hide';
document.layers['sub3'].visibility = 'show';
document.layers['subtop3'].visibility = 'show';
document.layers['sub4'].visibility = 'hide';
document.layers['subtop4'].visibility = 'hide';
document.layers['sub5'].visibility = 'hide';
document.layers['subtop5'].visibility = 'hide';
document.layers['sub6'].visibility = 'hide';
document.layers['subtop6'].visibility = 'hide';
}
if(is.ie){
document.all.sub3.style.visibility = 'visible';
document.all.subtop3.style.visibility = 'visible';
}
}

function showDrop4(){
if(is.ns6){
document.getElementById('sub4').style.visibility = 'visible';
document.getElementById('subtop4').style.visibility = 'visible';
}
if(is.ns4){
document.layers['sub1'].visibility = 'hide';
document.layers['subtop1'].visibility = 'hide';
document.layers['sub2'].visibility = 'hide';
document.layers['subtop2'].visibility = 'hide';
document.layers['sub3'].visibility = 'hide';
document.layers['subtop3'].visibility = 'hide';
document.layers['sub4'].visibility = 'show';
document.layers['subtop4'].visibility = 'show';
document.layers['sub5'].visibility = 'hide';
document.layers['subtop5'].visibility = 'hide';
document.layers['sub6'].visibility = 'hide';
document.layers['subtop6'].visibility = 'hide';
}
if(is.ie){
document.all.sub4.style.visibility = 'visible';
document.all.subtop4.style.visibility = 'visible';
}
}

function showDrop5(){
if(is.ns6){
document.getElementById('sub5').style.visibility = 'visible';
document.getElementById('subtop5').style.visibility = 'visible';
}
if(is.ns4){
document.layers['sub1'].visibility = 'hide';
document.layers['subtop1'].visibility = 'hide';
document.layers['sub2'].visibility = 'hide';
document.layers['subtop2'].visibility = 'hide';
document.layers['sub3'].visibility = 'hide';
document.layers['subtop3'].visibility = 'hide';
document.layers['sub4'].visibility = 'hide';
document.layers['subtop4'].visibility = 'hide';
document.layers['sub5'].visibility = 'show';
document.layers['subtop5'].visibility = 'show';
document.layers['sub6'].visibility = 'hide';
document.layers['subtop6'].visibility = 'hide';
}
if(is.ie){
document.all.sub5.style.visibility = 'visible';
document.all.subtop5.style.visibility = 'visible';
}
}


function showDrop6(){
if(is.ns6){
document.getElementById('sub6').style.visibility = 'visible';
document.getElementById('subtop6').style.visibility = 'visible';
}
if(is.ns4){
document.layers['sub1'].visibility = 'hide';
document.layers['subtop1'].visibility = 'hide';
document.layers['sub2'].visibility = 'hide';
document.layers['subtop2'].visibility = 'hide';
document.layers['sub3'].visibility = 'hide';
document.layers['subtop3'].visibility = 'hide';
document.layers['sub4'].visibility = 'hide';
document.layers['subtop4'].visibility = 'hide';
document.layers['sub5'].visibility = 'hide';
document.layers['subtop5'].visibility = 'hide';
document.layers['sub6'].visibility = 'show';
document.layers['subtop6'].visibility = 'show';
}
if(is.ie){
document.all.sub6.style.visibility = 'visible';
document.all.subtop6.style.visibility = 'visible';
}
}


//DropThem Functions

function hideThem(){
if(is.ns4){
document.layers['sub1'].visibility = 'hide';
document.layers['subtop1'].visibility = 'hide';
document.layers['sub2'].visibility = 'hide';
document.layers['subtop2'].visibility = 'hide';
document.layers['sub3'].visibility = 'hide';
document.layers['subtop3'].visibility = 'hide';
document.layers['sub4'].visibility = 'hide';
document.layers['subtop4'].visibility = 'hide';
document.layers['sub5'].visibility = 'hide';
document.layers['subtop5'].visibility = 'hide';
document.layers['sub6'].visibility = 'hide';
document.layers['subtop6'].visibility = 'hide';
}
if(is.ns6){
document.getElementById('sub1').style.visibility = 'hidden';
document.getElementById('subtop1').style.visibility = 'hidden';
document.getElementById('sub2').style.visibility = 'hidden';
document.getElementById('subtop2').style.visibility = 'hidden';
document.getElementById('sub3').style.visibility = 'hidden';
document.getElementById('subtop3').style.visibility = 'hidden';
document.getElementById('sub4').style.visibility = 'hidden';
document.getElementById('subtop4').style.visibility = 'hidden';
document.getElementById('sub5').style.visibility = 'hidden';
document.getElementById('subtop5').style.visibility = 'hidden';
document.getElementById('sub6').style.visibility = 'hidden';
document.getElementById('subtop6').style.visibility = 'hidden';
}
if(is.ie){
document.all.sub1.style.visibility = 'hidden';
document.all.subtop1.style.visibility = 'hidden';
document.all.sub2.style.visibility = 'hidden';
document.all.subtop2.style.visibility = 'hidden';
document.all.sub3.style.visibility = 'hidden';
document.all.subtop3.style.visibility = 'hidden';
document.all.sub4.style.visibility = 'hidden';
document.all.subtop4.style.visibility = 'hidden';
document.all.sub5.style.visibility = 'hidden';
document.all.subtop5.style.visibility = 'hidden';
document.all.sub6.style.visibility = 'hidden';
document.all.subtop6.style.visibility = 'hidden';
}
}