img_open=new Image(13,13);
img_open.src="/images/cat/open.gif";
img_close=new Image(13,13);
img_close.src="/images/cat/close.gif";



//this switches expand collapse icons
function change_img(imagename,objectsrc){
	if (document.images){
	document.images[imagename].src=eval(objectsrc+".src");
	}
}


function toggle(id) {
	var section = document.getElementById(id); 

	if(section.style.display=="none") {
		section.style.display="block";  
		change_img(("img"+id),'img_close');
	}
	else if(section.style.display=="block") {
		section.style.display="none";
		change_img(("img"+id),'img_open');
	}
	else{
		alert("Sorry, you must upgrade your broswer to 4.0 or above");
	}	
}


//added for eFollets textbook purchases
function submitForm(formName) {
	document.forms[''+formName+''].submit();
}