var W3C = document.getElementById? true : false;
var NN4 = document.layers? true : false;
var IE4 = document.all? true : false;


function changeImage(img_name,img_src) {
	document[img_name].src=img_src;
}

function putStr(string)
{
	document.insertform.message.value += string;
}

function show(layerName)
{
	if (W3C)
	{
		document.getElementById(layerName).style.visibility = "visible";
	}
	else if (IE4) 
	{
		document.all[layerName].style.visibility = "visible";
	}
	else if(NN4) 
	{
		document.layers[layerName].visibility = "show";
	}
}




function hide(layerName)
{
	if (W3C)
	{
		document.getElementById(layerName).style.visibility = "hidden";
	}
	else if (IE4) 
	{
		document.all[layerName].style.visibility = "hidden";
	}
	else if(NN4)
	{
		document.layers[layerName].visibility = "hidden";
	}
}

function swapVisibility(layerName,layer2,distance)
{
	if (W3C)
	{
		if (document.getElementById(layerName).style.visibility == "visible")
		{
			hide(layerName);
			moveBack(layer2,distance);
		}
		else
		{
			show(layerName);
			moveForth(layer2);
		};
	}
	else if (IE4) 
	{
		document.all[layerName].style.visibility = "visible";
	}
	else if(NN4) 
	{
		document.layers[layerName].visibility = "show";
	}
}

function move(layer1,layer2,distance)
{
	document.getElementByID(layer1).style.top = (parseInt(document.getElementByID(layer2).style.top) + distance) + "px";
}

function moveForth(layerName)
{
	if (W3C)
	{
		document.getElementById(layerName).style.top = "0px";
	}
	else if (IE4) 
	{
		document.all[layerName].style.top = "0px";
	}
	else if(NN4) 
	{
		document.layers[layerName].top = "0px";
	}
}
function moveBack(layerName,distance)
{
	if (W3C)
	{
		document.getElementById(layerName).style.top =distance;
	}
	else if (IE4) 
	{
		document.all[layerName].style.top = distance;
	}
	else if(NN4) 
	{
		document.layers[layerName].top = distance;
	}
}

function goToURL(question,url)
{
 var where_to= confirm(question);
 if (where_to== true)
 {
   window.location=url;
 }
}

function SetCookie (name, value) 
{
	var argv = SetCookie.arguments;
	var argc = SetCookie.arguments.length;
	var expires = (argc > 2) ? argv[2] : null;
	var path = (argc > 3) ? argv[3] : null;
	var domain = (argc > 4) ? argv[4] : null;
	var secure = (argc > 5) ? argv[5] : false;
	document.cookie = name + "=" + escape (value) + 
		((expires == null) ? "" : ("; expires=" +
		expires.toGMTString())) +
		((path == null) ? "" : ("; path=" + path)) +
		((domain == null) ? "" : ("; domain=" + domain)) +
		((secure == true) ? "; secure" : "");
}

function swapDisplay(el)
{
	var element = document.getElementById(el);
	if (element.style.display=="none")
	{
		element.style.display = "";
	}
	else 
	{
		element.style.display = "none";
	}
}

function swapDisplayAndSave(el,cookieName)
{
	var element = document.getElementById(el);
	if (element.style.display=="none")
	{
		element.style.display = "";
		SetCookie(cookieName,'');
	}
	else 
	{
		element.style.display = "none";
		SetCookie(cookieName,'none');
	}
}