var blanketsURL = "imgs/blankets1.jpg";

if (document.images) {
     var blankets1 = new Image();
     blankets1.src = "imgs/blankets1.jpg";

     var blankets2 = new Image();
     blankets2.src = "imgs/blankets2.jpg";
	 
	 var blankets3 = new Image();
	 blankets3.src = "imgs/blankets3.jpg";
}

function changeBlankets() {
     if (document.images) {
        if (blanketsURL == "imgs/blankets1.jpg") blanketsURL = "imgs/blankets2.jpg";
		else if (blanketsURL == "imgs/blankets2.jpg") blanketsURL = "imgs/blankets3.jpg";
		
         document.myBlankets.src = blanketsURL;
	}
}