Keyarn Graham Plz Sir, in this type of script, what kind of click button will i use to display all de tree values at ones

<script> function first(){ document.getElementById('main').innerHTML='<b>The first page</b>'; } function second(){ document.getElementById('main').innerHTML='<b>The second page</b>'; } function third(){ document.getElementById('main').innerHTML='<b>The third page</b>'; } </script>

asin when i click on de button den dis tree value will apear

The First Page, The 2nd Page, The 3rd page

all in one button. Plz sir help me