//
// ESTABLISH BROWSER AND PLATFORM
// ADAPTED FROM NETSCAPE WITH PERMISSION
//


var agt = navigator.userAgent.toLowerCase();
var is_major = parseInt(navigator.appVersion);
var is_minor = parseFloat(navigator.appVersion);

var is_nav    = ((agt.indexOf('mozilla')!=-1) && (agt.indexOf('spoofer')==-1) && (agt.indexOf('compatible') == -1) && (agt.indexOf('opera')==-1) && (agt.indexOf('webtv')==-1));
var is_nav4   = (is_nav && (is_major == 4));
var is_nav4up = (is_nav && (is_major >= 4));
var is_nav5   = (is_nav && (is_major == 5));
var is_nav5up = (is_nav && (is_major >= 5));

var is_ie    = (agt.indexOf("msie") != -1);
var is_ie4   = (is_ie && (is_major == 4) && (agt.indexOf("msie 5")==-1) );
var is_ie4up = (is_ie && (is_major >= 4));
var is_ie5   = (is_ie && (is_major == 4) && (agt.indexOf("msie 5")!=-1) );
var is_ie5up = (is_ie && !is_ie4);

var is_aol   = (agt.indexOf("aol") != -1);
var is_aol4  = (is_aol && is_ie4);

var is_opera = (agt.indexOf("opera") != -1);
var is_webtv = (agt.indexOf("webtv") != -1);

var is_win = ( (agt.indexOf("win")!=-1) || (agt.indexOf("16bit")!=-1) );
var is_mac = (agt.indexOf("mac")!=-1);

var nscp4 = is_nav4
var ie4   = is_ie4
var dom1  = (is_nav5up || is_ie5up)

if (is_mac && is_ie5)
{	dom1 = false
}

//
// CREATE APPROPRIATE OBJECT
//


function getObj(obj)
{	if (dom1)
	{	compLayr = document.getElementById(obj).style
	}
	else if (nscp4)
	{	compLayr = document.layers[obj]
	}
	else
	{	compLayr = document.all[obj].style
	}
	return compLayr
}


//
// CUSTOM APIs
//


function setTop(layr,num)
{	obj = getObj(layr)
	obj.top = num
}

function setLeft(layr,num)
{	obj = getObj(layr)
	obj.left = num
}

function getTop(layr)
{	obj = getObj(layr)
	if (dom1)
	{	return (document.getElementById(layr).offsetTop)
	}
	else if (nscp4)
	{	return (obj.top)
	}
	else
	{	return (obj.posTop)
	}
}

function getLeft(layr)
{	obj = getObj(layr)
	if (dom1)
	{	return (document.getElementById(layr).offsetLeft)
	}
	else if (nscp4)
	{	return (obj.left)
	}
	else
	{	return (obj.posLeft)
	}
}

function incTop(layr,num)
{	obj = getObj(layr)
	obj.top = getTop(layr) + num
}

function incLeft(layr,num)
{	obj = getObj(layr)
	obj.left = getLeft(layr) + num
}

function setZindex(layr,num)
{	obj = getObj(layr)
	obj.zIndex = num
}

function show(layr)
{	obj = getObj(layr)
	obj.visibility = "visible"
}

function hide(layr)
{	obj = getObj(layr)
	obj.visibility = "hidden"
}

function layerWidth(layr)
{	if (dom1)
	{	return (document.getElementById(layr).offsetWidth)
	}
	else if (nscp4)
	{	return eval("document." + layr + ".document.width")
	}
	else
	{	return (document.all[layr].scrollWidth)
	}
}
	
function layerHeight(layr)
{	if (dom1)
	{	return (document.getElementById(layr).offsetHeight)
	}
	else if (nscp4)
	{	return eval("document." + layr + ".document.height")
	}
	else if (is_ie)
	{	return (document.all[layr].scrollHeight)
	}
	else
	{	return (0)
	}
}

function layerClip(layr,topA,rightA,bottomA,leftA)
{	obj = getObj(layr)
	if (dom1 || (ie4 && !is_mac))
	{	obj.clip = "rect(" + topA + " " + rightA + " " + bottomA + " " + leftA + ")"
	}
	else if (nscp4)
	{	obj.clip.top = topA
		obj.clip.left = leftA
		obj.clip.bottom = bottomA
		obj.clip.right = rightA
	}
	else if (ie4 && is_mac)
	{	obj.clip = "rect(0 100% 100% 0)"
	}
}

function browserWidth()
{	if (is_nav)
	{	return (window.innerWidth)
	}
	else
	{	return (document.body.clientWidth)
	}
}

function browserHeight()
{	if (is_nav)
	{	return (window.innerHeight)
	}
	else
	{	return (document.body.clientHeight)
	}
}