function hideall()
{
	document.getElementById('layer1').style.visibility = 'hidden';
     document.getElementById('layer2').style.visibility = 'hidden'; 
	 document.getElementById('layer3').style.visibility = 'hidden'; 
	 document.getElementById('layer4').style.visibility = 'hidden';
	 document.getElementById('layer5').style.visibility = 'hidden';
	 document.getElementById('layer6').style.visibility = 'hidden';
	 document.getElementById('layer7').style.visibility = 'hidden';
	 document.getElementById('layer8').style.visibility = 'hidden';
	 document.getElementById('layer9').style.visibility = 'hidden';
	 document.getElementById('layer10').style.visibility = 'hidden';
	 document.getElementById('layer11').style.visibility = 'hidden';
}
function chklayer(v) {
     
     if (v == "0") {
     hideall();
	 document.getElementById('layer1').style.visibility = 'visible';
     
          return false;
     } else if (v == "1") {

     hideall();
	 document.getElementById('layer2').style.visibility = 'visible';
      
     } else if (v == "2") {
     hideall();
	 document.getElementById('layer3').style.visibility = 'visible';
     
      
     } else if (v == "3") {
     hideall();
	 document.getElementById('layer4').style.visibility = 'visible';
     
     }
	     else if (v == "4") {
	 hideall();
	 document.getElementById('layer5').style.visibility = 'visible';		  
     
     }
	 	     else if (v == "5") {
	 hideall();
	 document.getElementById('layer6').style.visibility = 'visible';
	
     }
	  	     else if (v == "6") {
	 hideall();
	 document.getElementById('layer7').style.visibility = 'visible';
	 
     }
	  	     else if (v == "7") {
	hideall();
	  document.getElementById('layer8').style.visibility = 'visible';
	  
     }
	 	  	     else if (v == "8") {
	 hideall();
	 document.getElementById('layer9').style.visibility = 'visible';
	 
     }
	 	 	  	     else if (v == "9") {
	 hideall();
	 document.getElementById('layer10').style.visibility = 'visible';
	 }
	 	 	  	     else if (v == "10") {
	 hideall();
	 document.getElementById('layer11').style.visibility = 'visible';
	  }
	 
     
}