Bloquar seleção do texto

CODIGO 1


<script type="text/javascript">
function disableSelection(target){
if (typeof target.onselectstart!="undefined") //IE route
target.onselectstart=function(){return false}
else if (typeof target.style.MozUserSelect!="undefined") //Firefox route
target.style.MozUserSelect="none"
else //All other route (ie: Opera)
target.onmousedown=function(){return false}
target.style.cursor = "default"
}
</script>


CODIGO 2


<script type="text/javascript">
disableSelection(document.body) //disable text selection on entire body of page
</script>