var ImgNum1, Img1, ImgNum2, Img2, Count=0
function Swapper(ImgName){
  
  if (Count==1){
  	do {
  		Img2=ImgName; ImgNum2=document.images[Img2].src; document.images[Img2].src=ImgNum1,
    	document.images[Img1].src=ImgNum2; 
		Count=0;
	   }
 	while(Count=0);
  }
 	else {Img1=ImgName; ImgNum1=document.images[Img1].src; Count=1}
}