/////////////////////////////////////////////////////////////////////////////////
 // Purpose: This script contains the functions that displays
 // 		the map overlays. Because of the need to retain the state of 
 // 		the overlay map when going tp different zooms these functions are
 // 		placed in the default.htm file so that variables become global
 // 		across the frames.
 // Pre:	All the correct files and links exist 
 //		Frames have been named according to Clint specs
 //		4+ browsers 
 ////////////////////////////////////////////////////////////////////////////////
 var isIE4=false;
var isIE5=false;
var isNav4=false;
var isNav6=false;

 if ((document.getElementById)&& (navigator.appName == "Netscape")){
	isNav6=true;
//	alert("NN6 code");
}
 else if (document.getElementById) {
 	isIE5=true;
//	alert("IE5 code");
}
 else if (document.all) {
	isIE4=true;
//	alert("IE toc code");
}
else if (navigator.appName == "Netscape" && parseInt(navigator.appVersion) >= 4){
	isNav4=true;
//	alert("Nav4 toc code");
}

 var zIndex=3;
  var loaded=false;
 var visiblelayer=-1;

 function selections(prefix,rank){
       
       
 	
       this.imageoff=new Image();			// off image name
       this.imageoff.src="himages/"+prefix+rank+"off"+".gif";			
       this.imageon=new Image();			// mouse over image name
 	this.imageon.src="himages/"+prefix+rank+"on"+".gif";
 }
 			
 
 function SwapImage(imagenum,mname,action,mlayer){
 ////////////////////////////////////////////////////////////////////////
 //	Purpose:	Swap menu selection images
 //	Pre:		Valid layers and images exist
 //			Selection objects have been created 
 ///////////////////////////////////////////////////////////////////////	
		if(isNav4){
			 if(mlayer != 'none'){
				mlayer=mlayer+'.document.';
				 var obj=eval("document."+mlayer+mname+imagenum);
			 }
			 else{			
				var obj=eval("document."+mname+imagenum);
			 }	
		}
		else if (isIE4){
		 	var obj=eval("document."+mname+imagenum);
		}
		else if(isIE5){
			var obj=eval("document."+mname+imagenum);
		}
		else if (isNav6){
			var obj=eval("document."+mname+imagenum);
		}
  		if(action == 0){
			obj.src=mopt[imagenum].imageoff.src;
		 }
 		 else if (action==1){
 			obj.src=mopt[imagenum].imageon.src;
		  }
}
 
 var mopt = new Array();
 mopt[0]= new selections('mopt',0);
 mopt[1]= new selections('mopt',1);
 mopt[2]= new selections('mopt',2);
 mopt[3]= new selections('mopt',3);
 mopt[4]= new selections('mopt',4);
 mopt[5]= new selections('mopt',5);
 mopt[6]= new selections('mopt',6);
 mopt[11]= new selections('mopt',11);
 mopt[8]= new selections('mopt',8);
 mopt[9]= new selections('mopt',9);
 mopt[10]= new selections('mopt',10);
 mopt[12]= new selections('mopt',12);
 mopt[13]= new selections('mopt',13);
 mopt[14]= new selections('mopt',14);
 mopt[15]= new selections('mopt',15);
  mopt[16]= new selections('mopt',16);
  mopt[18]= new selections('mopt',18);
  mopt[19]= new selections('mopt',19);
 function SetHour(obj){
 	var newvalue=eval(obj.options[obj.selectedIndex].value);
       parent.displayhour=newvalue;
 	parent.MAIN.location.reload(true);
 }

 function SetParam(num){
 	parent.displaytype=num;
  }
function SetButtonOn(but){
		if(isNav4){
			document.chghours.par[0].checked=true;	
		}
		else if (isIE4){
			document.all.par[0].checked=true;          
		}
		else if(isIE5){
 			document.chghours.par[0].checked=true;	 
		}
		else if (isNav6){
			document.chghours.par[0].checked=true;	

		}

               


}
 function SetDomain(num){
 	parent.fdomain=num;
  }
  function isLoaded(){
         
  	parent.tocloaded=true;
  	
  }