<a href="" onClick="javascript:this.innerHTML = 'close'">Open</a>
You can also call some switching function to replace the text with a few taps.
function toggle(lnk_obj){
lnk_obj.innerHTML = (lnk_obj.innerHTML == 'close') ? 'open' : 'close' ;
}
<a href="" onClick="javascript:toggle(this);">Open</a>
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