function
ButtonDisplay_onclick() {
var i;
var
words = new Array();
words[0] = "stupid";
words[1] = "idiot";
words[2] = "yuck";
var
s = document.getElementById("DisplayTxt").value;
var
s2 = document.getElementById("aa").value;
for
(i = 0; i < words.length; i++) {
if
(s.match(words[i]) == words[i]) {
document.getElementById("DisplayTxt").focus();
document.getElementById("DisplayTxt").value = "";
}
}
}
<div id="aa">
<input id="ButtonDisplay" type="button" value="Click On" onclick="return ButtonDisplay_onclick()" />
<input type="text" id="DisplayTxt" />
</div>