// JavaScript Document

myImage = new Image() 
myImage.src = "images/comparetreatments_over.jpg" 
myImage1 = new Image() 
myImage1.src = "images/clinics_over.jpg" 
myImage2 = new Image() 
myImage2.src = "images/oursurgeons_over.jpg" 

function swap(x){
	a=document.getElementById(x+"_image").src.split("/");
	thefile=a.pop();
	
	z=thefile.split(".");//get rid of .gif or .jpg
	y=z[0].split("_over");
	if(z[0]==y[0]){// if split makes no difference - image is not already a '_over' rollover image
		extrabit="_over.";// so make rollover 
	}else{
		extrabit=".";// else back to normal image
	}
	
	newimage=y[0]+extrabit+z[1];
	document.getElementById(x+"_image").src="images/"+newimage;

}