// JavaScript Document

// toggle display of blocks
function toggle(field) {
	if(document.getElementById) {
		
		if (document.getElementById(field + '_o').style.display=="block"){
			document.getElementById(field + '_o').style.display="none";
			document.getElementById(field + '_c').style.display="block";
			
		} else {
			document.getElementById(field + '_c').style.display="none";
			document.getElementById(field + '_o').style.display="block";
		}
	}
}