function writeLinks(){
str='A simple Menu'
str+='<P><a href="p_update1.htm">Page 1</a><BR>'
str+='<a href="p_update2.htm">Page 2</a><BR>'
str+='<a href="p_update3.htm">Page 3</a><BR>'
str+='<a href="p_update4.htm">Page 4</a><BR>'
str+='<P>'
str+='<table border="1" bordercolor="red"><tr><td>'
str+='A second example would be this table<P>Only written once but shown in all pages'
str+='</td></tr></table>'

document.getElementById("mylinks").innerHTML+=str
}