function swap(imagename) {
	document.getElementById("mainpic").src='img/'+imagename+'.jpg';
}

preLoad1=new Image();
preLoad1.src="img/baths1.jpg";
preLoad2=new Image();
preLoad2.src="img/baths2.jpg";
preLoad3=new Image();
preLoad3.src="img/baths3.jpg";
preLoad4=new Image();
preLoad4.src="img/baths4.jpg";
preLoad5=new Image();
preLoad5.src="img/baths5.jpg";
preLoad6=new Image();
preLoad6.src="img/baths6.jpg";
preLoad7=new Image();
preLoad7.src="img/baths7.jpg";