var nbrTabCount = 4;
var arrTab = new Array(nbrTabCount);
var arrTabOpen = new Array(nbrTabCount);

function initialize_tab_display() {
	for (var idx=1; idx <= nbrTabCount; idx++) {
		arrTab[idx] = eval("pptab_" + idx + ".innerHTML");
		arrTabOpen[idx] = true;
	}
}

function toggle_tab_display(nbrToggle) {
	if (arrTabOpen[nbrToggle] == true) {
		eval("pptab_" + nbrToggle + ".innerHTML = ''");
	} else {
		eval("pptab_" + nbrToggle + ".innerHTML = arrTab[nbrToggle]");
	}
	
	arrTabOpen[nbrToggle] = !(arrTabOpen[nbrToggle]);
}