<!-- script for rollovers -->

if (document.images) {

tn1on= new Image();
tn1on.src="/images/topnav/about_on.gif";  
tn1off= new Image();
tn1off.src="/images/topnav/about_off.gif";

tn2on= new Image();
tn2on.src="/images/topnav/conf_on.gif";  
tn2off= new Image();
tn2off.src="/images/topnav/conf_off.gif";

tn3on= new Image();
tn3on.src="/images/topnav/careers_on.gif";  
tn3off= new Image();
tn3off.src="/images/topnav/careers_off.gif";

tn4on= new Image();
tn4on.src="/images/topnav/sitemap_on.gif";  
tn4off= new Image();
tn4off.src="/images/topnav/sitemap_off.gif";

tn5on= new Image();
tn5on.src="/images/topnav/contact_on.gif";  
tn5off= new Image();
tn5off.src="/images/topnav/contact_off.gif";



mn1on= new Image();
mn1on.src="/images/mainnav/home_on.gif";  
mn1off= new Image();
mn1off.src="/images/mainnav/home_off.gif";

mn2on= new Image();
mn2on.src="/images/mainnav/topics_on.gif";  
mn2off= new Image();
mn2off.src="/images/mainnav/topics_off.gif";

mn3on= new Image();
mn3on.src="/images/mainnav/pubs_on.gif";  
mn3off= new Image();
mn3off.src="/images/mainnav/pubs_off.gif";

mn4on= new Image();
mn4on.src="/images/mainnav/advocacy_on.gif";  
mn4off= new Image();
mn4off.src="/images/mainnav/advocacy_off.gif";

mn5on= new Image();
mn5on.src="/images/mainnav/press_on.gif";  
mn5off= new Image();
mn5off.src="/images/mainnav/press_off.gif";

mn6on= new Image();
mn6on.src="/images/mainnav/membership_on.gif";  
mn6off= new Image();
mn6off.src="/images/mainnav/membership_off.gif";

}

function rollon(imgName)
 {
        if (document.images) {
        document[imgName].src = eval(imgName + "on.src");
        }
 }

function rolloff(imgName)
 {
        if (document.images) {
        document[imgName].src = eval(imgName + "off.src");
        }
 }

function MM_showHideLayers() { //v3.0
  var i,p,v,obj,args=MM_showHideLayers.arguments;
  for (i=0; i<(args.length-2); i+=3) if ((obj=MM_findObj(args[i]))!=null) { v=args[i+2];
    if (obj.style) { obj=obj.style; v=(v=='show')?'visible':(v='hide')?'hidden':v; }
    obj.visibility=v; }
}

function MM_findObj(n, d) { //v4.0
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
  if(!x && document.getElementById) x=document.getElementById(n); return x;
}


function calculate(sign) {
	if (sign == "plus")
		document.basket.quantity.value = eval(document.basket.quantity.value) + 1
	else {
		if (document.basket.quantity.value > 0)
			document.basket.quantity.value = eval(document.basket.quantity.value) - 1
	}
}

function recheck(obj) {
	if (! obj.checked) { obj.checked = true; }
}