var DOMtype=""
if (document.getElementById) {DOMtype='isID'}
else {if (document.all) {DOMtype='isAll'}
		 else {DOMtype='isLayers'}}

function findDOM(objectID){
				 switch (DOMtype){
				 case 'isID': {
				 return (document.getElementById(objectID).style);
				 break;}
				 case 'isAll': {
				 return (document.all[objectID].style);
				 break;}
				 default: {
				 return (document.layers[objectID])}}}

visibleLayer="";

function hide(){
				 for (x=1; x<=17; x++){
				 blank="chapter_" + x;
				 domHide=findDOM(blank);
				 domHide.display="none";}}
				 
function display(layer){
				  hide();
				 domStyle=findDOM(layer);
				 domStyle.display="block";
				 visibleLayer=layer;
				 scroll(0, 0);} 
				 
			 				 
function highlight(para){
				 domStyle=findDOM(para)
				 domStyle.background="#000080";
				 domStyle.color="#F5F5F5";
				 domStyle.cursor="pointer";}
function normal(para){
				 domStyle=findDOM(para)
				 domStyle.background="#F5F5F5";
				 domStyle.color="#000080";
				 domStyle.cursor="pointer";}
				 
function e(pre,org,end,text){
				 var pre;
				 var org;
				 var end;
				 var text;
				 document.write ("<a href='mailto:"+pre);
				 document.write ("@"+org+"."+end+"'>");
				 document.write (text);
				 document.write ("</a>")}