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

preLoad1=new Image();
preLoad1.src="img/studio1.jpg";
preLoad2=new Image();
preLoad2.src="img/studio2.jpg";
preLoad3=new Image();
preLoad3.src="img/studio3.jpg";
preLoad4=new Image();
preLoad4.src="img/studio4.jpg";
preLoad5=new Image();
preLoad5.src="img/studio5.jpg";