/* show  or hide an element adressed by id */
function showhide(id, state)
{
	obj = document.getElementById(id);
	if (state)
		obj.style.display = 'inline';
	else
		obj.style.display = 'none';
}

/* enable or disable a select field adressed by id */
/* the index param is the disabled field index */
prevSelect=0;
function selectdisable(id,state,index) {
	obj = document.getElementById(id);
	if (state) {
		obj.disabled = false;
		obj.selectedIndex = prevSelect;
	}
	else {
		prevSelect = obj.selectedIndex;
		obj.selectedIndex = index;
		obj.disabled = true;
	}
}

function checkFrame(page) {
	var loc=self.name;
	if (loc != "content")
		document.location = "index.php?page=" + page;
}