function disableSelection(target){
if (typeof target.onselectstart!="undefined")
	target.onselectstart=function(){return false}
else if (typeof target.style.MozUserSelect!="undefined")
	target.style.MozUserSelect="none"
else
	target.onmousedown=function(){return false}
target.style.cursor = "default"
}

disableSelection(document.body)