function showLayer(lyr) {
document.getElementById(currentLayer).className = 'hide';
document.getElementById(lyr).className = 'show';
currentLayer = lyr;
}

function showTab(lyr) {
document.getElementById(currentTab).className = 'taboff';
document.getElementById(lyr).className = 'tabon';
currentTab = lyr;
}

currentTab = 't1';
currentLayer = 'd1';

function submitenter(myfield,e){
	var keycode;
	if (window.event) keycode = window.event.keyCode;
	else if (e) keycode = e.which;
	else return true;
	
	if (keycode == 13)
	   {
	   myfield.form.submit();
	   return false;
	   }
	else
	   return true;
}