function parametricNav(theDiv, theButton){
	var paraDiv = document.getElementById(theDiv);
	var paraBtn = document.getElementById(theButton);
	if(paraDiv.style.display == "none"){
		paraDiv.style.display = "block";
		paraBtn.style.backgroundPosition = '0px -14px';
	}else{
		paraDiv.style.display = "none";	
		paraBtn.style.backgroundPosition = '0px 0px';
	}
}