Performing text with visible text instead of value

Hello
Can I check the text that appears instead of value 1 with MDULNB?
<option value=”1″>**MDULNB**</option>
this.value !== “MDULNB” , this.value != “MDULNB”

“`
<script language=”javascript”>
window.onload=function(){
var ikinciselect = document.getElementById(“mdu_tipi”);
document.getElementById(‘lnb_tipi’).onchange = function () {
ikinciselect.disabled = (this.value !== “MDULNB”);
if (this.value != “MDULNB”) {ikinciselect.value = “-1”;}
}
}
</script>
“`
“`
<option value=”-1″>&nbsp;</option>
<option value=”1″>MDULNB</option>
<option value=”2″>QUATTRO</option>
</select>
“`

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