function ShowLayer(id, flag){
		if(flag){
			if(id=='producta'){
				document.getElementById('producta').style.display='block'
				document.getElementById('productb').style.display='none'
				document.getElementById('productc').style.display='none'
	
				
			}
			else if(id=='productb'){
				document.getElementById('producta').style.display='none'
				document.getElementById('productb').style.display='block'
				document.getElementById('productc').style.display='none'
			
			}
		
			else if(id=='productc'){
				document.getElementById('producta').style.display='none'
				document.getElementById('productb').style.display='none'
				document.getElementById('productc').style.display='block'
			
			}
			return
		}
		
	}