function cssOnOff(){
var targetEL = document.getElementsByTagName("link");
for(i = 0; i < targetEL.length; i++){
	if(targetEL[i].rel == "stylesheet"){
		if(targetEL[i].disabled == false){
			targetEL[i].disabled = true;
			}
		else if(targetEL[i].disabled == true){
			targetEL[i].disabled = false;
			}
		}
	}
}