function verifyCompatibleBrowser(){ 
    this.ver=navigator.appVersion 
    this.dom=document.getElementById?1:0 
    this.ie5=(this.ver.indexOf("MSIE 5")>-1 && this.dom)?1:0; 
    this.ie4=(document.all && !this.dom)?1:0; 
    this.ns5=(this.dom && parseInt(this.ver) >= 5) ?1:0; 
 
    this.ns4=(document.layers && !this.dom)?1:0; 
    this.bw=(this.ie5 || this.ie4 || this.ns4 || this.ns5) 
    return this 
} 
bw=new verifyCompatibleBrowser() 
 
var speed=100 
 
var loop, timer 
 
function ConstructObject(obj,nest){ 
    	nest=(!nest) ? '':'document.'+nest+'.' 
    	this.el=bw.dom?document.getElementById(obj):bw.ie4?document.all[obj]:bw.ns4?eval(nest+'document.'+obj):0; 
    	this.css=bw.dom?document.getElementById(obj).style:bw.ie4?document.all[obj].style:bw.ns4?eval(nest+'document.'+obj):0; 
    	this.scrollHeight=bw.ns4?this.css.document.height:this.el.offsetHeight 
    	this.clipHeight=bw.ns4?this.css.clip.height:this.el.offsetHeight 
    	this.up=MoveAreaUp;this.down=MoveAreaDown; 
    	this.MoveArea=MoveArea; this.x; this.y; 
    	this.obj = obj + "Object" 
    	eval(this.obj + "=this") 
    	return this 
} 
function MoveArea(x,y){ 
    this.x=x;this.y=y;
    this.css.left=this.x + "px";
    this.css.top=this.y + "px";
} 
 
function MoveAreaDown(move){ 
	if(this.y>-this.scrollHeight+objContainer.clipHeight){ 
    this.MoveArea(0,this.y-move) 
    if(loop) setTimeout(this.obj+".down("+move+")",speed) 
	} 
} 
function MoveAreaUp(move){ 
	if(this.y<0){ 
    this.MoveArea(0,this.y-move) 
    if(loop) setTimeout(this.obj+".up("+move+")",speed) 
	} 
} 
 
function PerformScroll(speed){ 
	if(initialised){ 
		loop=true; 
		if(speed>0) objScroller.down(speed) 
		else objScroller.up(speed) 
	} 
} 
 
function CeaseScroll(){ 
    loop=false 
    if(timer) clearTimeout(timer) 
} 
var initialised; 
function InitialiseScrollableArea(){
		objContainer=new ConstructObject('divContainer') 
	    objScroller=new ConstructObject('divContent','divContainer') 
	    objScroller.MoveArea(0,0) 
	    objContainer.css.visibility='visible' 
	    initialised=true;
} 
// end absolutely positioned scrollable area object scripts

function MM_reloadPage(init) {  //reloads the window if Nav4 resized
  if (init==true) with (navigator) {if ((appName=="Netscape")&&(parseInt(appVersion)==4)) {
    document.MM_pgW=innerWidth; document.MM_pgH=innerHeight; onresize=MM_reloadPage; }}
  else if (innerWidth!=document.MM_pgW || innerHeight!=document.MM_pgH) location.reload();
}
MM_reloadPage(true);

function MM_preloadImages() { //v3.0
  var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
    var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
    if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}

function searchfields_highlight(is_highlighted){
	//search_phrase subject_id
	search_text = document.getElementById('search_text');
	subject_id = document.getElementById('subject_id');
	if(is_highlighted){
		search_text.style.backgroundColor = "#FFFF99";
		subject_id.style.backgroundColor = "#FFFF99";
	}
	else{
		search_text.style.backgroundColor = "#ffffff";
		subject_id.style.backgroundColor = "#ffffff";
	}
}

function fixLandingPageSpacing(){
	$('#landing-header').after("<br/>");
	$(".ie-remove").remove();
}

$(document).ready(function() {
    
    if($(this).find('div#divContainer')){
		InitialiseScrollableArea();
	}
	
	if(is_old_ie()){
		fixLandingPageSpacing();
	}
    
    var default_center_text;
    
    $('.tab-link').hover(
        function() {
            default_center_text = $('#explanation-content').html();
            var nav_link = $("a[href='"+$(this).parent().attr('href')+"'][class='top-nav-link']").children();
            if (nav_link.attr('src')) {
                nav_link.attr('src',nav_link.attr('src').replace('_off','_active'));
            }
            $(this).attr('src', $(this).attr('src').replace(/\.(gif|png)$/,"_over.$1"));
            $('#explanation-content').html($('#'+$(this).attr('name')).html());
        },
        function() {
            var nav_link = $("a[href='"+$(this).parent().attr('href')+"'][class='top-nav-link']").children();
            if (nav_link.attr('src')) {
                nav_link.attr('src',nav_link.attr('src').replace('_active','_off'));
            }
            $('#explanation-content').html(default_center_text);
            $(this).attr('src', $(this).attr('src').replace(/_over\.(gif|png)$/,".$1"));
    });
    
    $(".register-link").mouseover( function() {
        $(this).next('.register-overlay').show();
    }).mouseout( function() {
        $(this).next('.register-overlay').hide();
    });
});

function is_old_ie() {
    if ($.browser.msie && (parseInt($.browser.version) == 6 || parseInt($.browser.version) == 7)) {
        return true;
    }
}