var num = 0;

function Stylekaeru(){
if((num % 2) == 0){StyleSheet_Off(1);}
if((num % 2) == 1){StyleSheet_On(1);}
num++;
}

function StyleSheet_Off(bango){
if(document.styleSheets) {
	var myarra=document.styleSheets;
	myarra[bango].disabled=true;	
	}
}

function StyleSheet_On(ban1){
 if(document.styleSheets) {
	var myarra=document.styleSheets;
	myarra[ban1].disabled=false;  
	}
}