// JavaScript Document
var current ;
function swap( n, c){


if ( n==0 && c == current ) {} else {

 el = "b"+c;
 e = document.getElementById(el);
eval("e.className='m"+n+"'");

switch (c) {
 case 0:
      e0 = document.getElementById("t0");
      e1 = document.getElementById("t1");
   if(n==1) {
   
   (current==1) ? c="brdr15":c="brdr11";   
   e0.className="crnrleft1";
   e1.className=c;
   } else {
   (current==1) ? c="brdr12":c="brdr10"; 
   e0.className="crnrleft0";
   e1.className=c;
   }
  break; 
case 1:
   e1 = document.getElementById("t1");
   e2 = document.getElementById("t2");
   if(n==1) {
   (current==0) ? c = "brdr15":c="brdr12";
   (current==2) ? d = "brdr15" : d="brdr11";
   e1.className=c;
   e2.className=d;
   } else {
   (current==0)? c="brdr11":c="brdr10";
   (current==2) ? d="brdr12": d="brdr10";
   e1.className=c;
   e2.className=d;
   }
   break;
case 2:
   e2 = document.getElementById("t2");
   e3 = document.getElementById("t3");
   if(n==1) {
   (current==1) ? c="brdr15":c="brdr12";
   (current==3) ? d = "brdr15" : d="brdr11";
   e2.className=c;
   e3.className=d;
   } else {
   (current==1) ? c="brdr11":c="brdr10";
   (current==3) ? d="brdr12": d="brdr10";
   e2.className=c;
   e3.className=d;
   }
   break;
case 3:
   e3= document.getElementById("t3");
   e4= document.getElementById("t4");
   if(n==1) {
   (current==2) ? c="brdr15":c="brdr12";
   (current==4) ? d = "brdr15" : d="brdr11";
   e3.className=c;
   e4.className=d;
   } else {
   (current==2) ? c="brdr11":c="brdr10";
   (current==4) ? d="brdr12": d="brdr10";   
   e3.className=c;
   e4.className=d;
   }
   break;
case 4:
   e4 = document.getElementById("t4");
   e5 = document.getElementById("t5");
   if(n==1) {
   (current==3) ? c="brdr15":c="brdr12";
   (current==5) ? d = "brdr15" : d="brdr11";
   e4.className=c;
   e5.className=d;
   } else {
   (current==3) ? c="brdr11":c="brdr10";
   (current==5) ? d="brdr12": d="brdr10";   
   e4.className=c;
   e5.className=d;
   }
   break;
case 5:
   e5 = document.getElementById("t5");
   e6 = document.getElementById("t6");    
   if(n==1) {
   (current==4) ? c="brdr15":c="brdr12";
   (current==6) ? d = "brdr15" : d="brdr11";
   e5.className=c;
   e6.className=d;
   } else {
   (current==4) ? c="brdr11":c="brdr10";
   (current==6) ? d="brdr12": d="brdr10";  
   e5.className=c;
   e6.className=d;
   }
   break;
case 6:
   e6 = document.getElementById("t6");
   e7 = document.getElementById("t7");
   if(n==1) {
      (current==5) ? c="brdr15":c="brdr12";
   e6.className=c;
   e7.className="crnrright1";
   } else {
   (current==5) ? c="brdr11":c="brdr10";
   e6.className=c;
   e7.className="crnrright0";
   }
}

}
}
function clear() {
	for ( x=0; x<=6;x++) {
       swap(0,x);  
     }
}	 

function nav(n){
// Add site urls here.... u[2] = "dry-tortugas-history.htm" ...etc. 
//alert("current is: " + current);
current = n;
clear();

swap(1,n);
 var u = new Array();

 u[0] = "dry-tortugas-nature-science.htm";
 u[1] = "dry-tortugas-nature-birding.htm";
 u[2] = "dry-tortugas-nature-turtles.htm";
 u[3] = "dry-tortugas-nature-marine.htm";
 u[4] = "dry-tortugas-nature-coral.htm";
 u[5] = "dry-tortugas-nature-rangernews.htm";
 u[6] =	"none";
  
 location.href=u[n];
 

}