<script>
function blockKey(item){
if(event.keyCode==9) {
item.focus();
space = " ";
item.selection=document.selection.createRange();
item.selection.text=space;
event.returnValue = false;
}
}
</script>
<textarea id="textField" onkeydown="blockKey(this);" cols="70" rows="10"></textarea>
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