// SNF JAVASCRIPT snf2_utilities.js VERSION 1.0
// General variables
var onImg = new Array();
var offImg = new Array();

// *********************************************************************
// ROLLOVERS FOR MAIN MENU
// *********************************************************************
if (document.images) {
	onImg["ARROW1"] = new Image();
	offImg["ARROW1"] = new Image();
	onImg["ARROW1"].src = "./GRAPHICS/ARROW_DN.JPG";
	offImg["ARROW1"].src = "./GRAPHICS/ARROW_UP.JPG";
	onImg["ARROW2"] = new Image();
	offImg["ARROW2"] = new Image();
	onImg["ARROW2"].src = "./GRAPHICS/ARROW_DN.JPG";
	offImg["ARROW2"].src = "./GRAPHICS/ARROW_UP.JPG";
	onImg["ARROW3"] = new Image();
	offImg["ARROW3"] = new Image();
	onImg["ARROW3"].src = "./GRAPHICS/ARROW_DN.JPG";
	offImg["ARROW3"].src = "./GRAPHICS/ARROW_UP.JPG";
	onImg["ARROW4"] = new Image();
	offImg["ARROW4"] = new Image();
	onImg["ARROW4"].src = "./GRAPHICS/ARROW_DN.JPG";
	offImg["ARROW4"].src = "./GRAPHICS/ARROW_UP.JPG";		
  }

// *************************************************************
//  CLIENT_SIDE SNIFFER CODE
// *************************************************************
// convert all characters to lowercase to simplify testing 
var agt=navigator.userAgent.toLowerCase(); 

// *** BROWSER VERSION *** 
// Note: On IE5, these return 4, so use is_ie5up to detect IE5. 
var is_major = parseInt(navigator.appVersion); 
var is_minor = parseFloat(navigator.appVersion); 

// *** BROWSER TYPE *** 
var is_nav  = ((agt.indexOf('mozilla')!=-1) && (agt.indexOf('spoofer')==-1) 
            && (agt.indexOf('compatible') == -1) && (agt.indexOf('opera')==-1) 
            && (agt.indexOf('webtv')==-1));
var is_nav4up = (is_nav && (is_major >= 4));  
var is_ie   = (agt.indexOf("msie") != -1); 
var is_ie3  = (is_ie && (is_major < 4)); 
var is_ie4  = (is_ie && (is_major == 4) && (agt.indexOf("msie 5.0")==-1) );
var is_ie4up  = (is_ie  && (is_major >= 4));
var is_ie5  = (is_ie && (is_major == 4) && (agt.indexOf("msie 5.0")!=-1) );  
var is_ie5up  = (is_ie  && !is_ie3 && !is_ie4);  

// *** PLATFORM ***
var is_win   = ( (agt.indexOf("win")!=-1) || (agt.indexOf("16bit")!=-1) );
var is_mac    = (agt.indexOf("mac")!=-1);
var is_sun   = (agt.indexOf("sunos")!=-1);
var is_irix  = (agt.indexOf("irix") !=-1);    // SGI
var is_hpux  = (agt.indexOf("hp-ux")!=-1);
var is_aix   = (agt.indexOf("aix") !=-1);      // IBM
var is_linux = (agt.indexOf("inux")!=-1);
var is_sco   = (agt.indexOf("sco")!=-1) || (agt.indexOf("unix_sv")!=-1);
var is_unixware = (agt.indexOf("unix_system_v")!=-1); 
var is_mpras    = (agt.indexOf("ncr")!=-1); 
var is_reliant  = (agt.indexOf("reliantunix")!=-1);
var is_dec   = ((agt.indexOf("dec")!=-1) || (agt.indexOf("osf1")!=-1) || 
       (agt.indexOf("dec_alpha")!=-1) || (agt.indexOf("alphaserver")!=-1) || 
       (agt.indexOf("ultrix")!=-1) || (agt.indexOf("alphastation")!=-1)); 
var is_sinix = (agt.indexOf("sinix")!=-1);
var is_freebsd = (agt.indexOf("freebsd")!=-1);
var is_bsd = (agt.indexOf("bsd")!=-1);
var is_unix  = ((agt.indexOf("x11")!=-1) || is_sun || is_irix || is_hpux || 
             is_sco ||is_unixware || is_mpras || is_reliant || 
             is_dec || is_sinix || is_aix || is_linux || is_bsd || is_freebsd);

// Handle Navigator 4 window resizing
if (is_nav4up) {
   var initWidth, initHeight;
   initWidth = window.innerWidth;
   initHeight = window.innerHeight;
   window.captureEvents(Event.RESIZE);
   window.onresize = handleResize;
}

// *********************************************************************
//  UTILITY FUNCTIONS
// *********************************************************************
// Function to handle window resizing on Navigator 4
function handleResize() {
   if ((initWidth != window.innerWidth) || (initHeight != window.innerHeight)) {
     location.reload();
   }
   return false;
}

// Swap images on based on a name array
function imageOn(name) {
   if (document.images) {
    document.images[name].src = onImg[name].src
   }
}

// Swap images off based on a name array 
function imageOff(name) {
   if (document.images) {
    document.images[name].src = offImg[name].src
   }
}