function changeImage(heightToCheck, headerToChange){
		
		//heightToCheck.Toggle();
		
		// Set variables based on parameters:
		var hgt = heightToCheck.el.offsetHeight;
		var hdr = document.getElementById(headerToChange);
		// Check height and adjust background image accordingly:
		if (hgt > 0) hdr.style.backgroundImage = "url(../images/plus.gif)";
		else hdr.style.backgroundImage = "url(../images/minus.gif)";
	};