function displayFormChars() {
	var charsTrigger = document.getElementById("characteristics_trigger");
	var usageTrigger = document.getElementById("usage_trigger");
	var charsForm = document.getElementById("characteristics");
	var usageForm = document.getElementById("usage");
	
	charsTrigger.className = "type1on";
	usageTrigger.className = "type2";
	usageForm.style.display = "none";
	charsForm.style.display = "inline";
}
function displayFormUsage() {
	var charsTrigger = document.getElementById("characteristics_trigger");
	var usageTrigger = document.getElementById("usage_trigger");
	var charsForm = document.getElementById("characteristics");
	var usageForm = document.getElementById("usage");
	
	charsTrigger.className = "type1";
	usageTrigger.className = "type2on";
	charsForm.style.display = "none";
	usageForm.style.display = "inline";
}