window.onload = addAllEvents;

function toggleDesc(e){
	var hideImg = '/povmap/imgs/datasets_desc_hide.gif';
	var hideAlt= 'Hide Description';
	var viewImg = '/povmap/imgs/datasets_desc_view.gif';
	var viewAlt = 'View Description';

	var img = document.getElementById('toggleImg');
	var dataOpts = getElementsByClassName(document, "div", "dataOpt");
	
	for(i = 0; i < dataOpts.length; i++){
		if (dataOpts[i].style.display == 'block' || dataOpts[i].className == "dataOpt displOn"){
			img.src = viewImg;
			img.alt = viewAlt;
			dataOpts[i].style.display = 'none';
			if(dataOpts[i].className == "dataOpt displOn")
				dataOpts[i].className = "dataOpt"
		}else{
			img.src = hideImg;
			img.alt = hideAlt;
			dataOpts[i].style.display = 'block';
		}
	}
	preventHref(e);
}
function addAllEvents(){
	addEvent(document.getElementById('toggle'),'click',toggleDesc);
}