var p_valSelected = "";
var p_previousAns = "";

//function called at the page load. Determines whether the links are available to the user based on
//if they have completed the Destination section.

//function to open a new window; The URL, Window Title, and parameters are passed into the function.
function openWin(URL,winTitle,winFeatures){
	window.open(URL,winTitle,winFeatures)
}

//function to swap the image to its rollover state and back
function imageSwitch(imgName, imgSwitch){
	//alert("Image Name: " + imgName )
	//alert("image switch: " + imgSwitch);
	eval("document." + imgName + ".src='" + imgSwitch + "'");
}

//function used to display and hide layers.
function showHideLayers(layerNum,layerVal){
	p_previousAns = p_valSelected;
	//Check to see if user had checked an option before, if so hide current layer.	
	if (p_previousAns != "" && p_previousAns != "NextBtns"){
		if (isNaN(p_valSelected)){
			eval("document.getElementById('" + p_previousAns + "').style.display = 'none'");
		}else{
			eval("document.getElementById('layer" + p_previousAns + "').style.display = 'none'");
		}
	}
	
	p_valSelected = layerNum
	if (isNaN(p_valSelected)){
		if (layerVal == "show"){
			eval("document.getElementById('" + p_valSelected + "').style.display = ''");
		}else{
			eval("document.getElementById('" + p_valSelected + "').style.display = 'none'");
		}	
	}else{
		if (layerVal == "show"){
			eval("document.getElementById('layer" + p_valSelected + "').style.display = ''");
		}else{
			eval("document.getElementById('layer" + p_valSelected + "').style.display = 'none'");
		}
	}
}

//function will be used when needing to open another layer within an open layer without it closing.
function showHideLayers2(layerNum,layerVal){
	p_valSelected = layerNum
	if (isNaN(p_valSelected)){
		if (layerVal == "show"){
			eval("document.getElementById('" + p_valSelected + "').style.display = ''");
		}else{
			eval("document.getElementById('" + p_valSelected + "').style.display = 'none'");
		}	
	}else{
		if (layerVal == "show"){
			eval("document.getElementById('layer" + p_valSelected + "').style.display = ''");
		}else{
			eval("document.getElementById('layer" + p_valSelected + "').style.display = 'none'");
		}
	}
}