/***************************************************************************
* Internet Explorer Margin Fix
* Copyright 2002 by David Schontzler | www.stilleye.com
* Free to use under GNU General Public License as long as this message
*  remains intact.
* Description:  This script will fix the horizontal margin support in IE5/6
***************************************************************************
* Version: 1.1.0
***************************************************************************/

if(!Array.prototype.push) // for ie5.x
{
	Array.prototype.push =  function()
	{
		var i, j;
		for(i=0; j=arguments[i]; i++) this[this.length] = j;
		return this.length;
	}
}

IEmarginFix =
{
	init : function()
	{
		var ua = navigator.userAgent.toLowerCase();
		if( (ua.indexOf("msie 5.") != -1 || ua.indexOf("msie 6.") != -1) && ua.indexOf('mac') == -1 && document.compatMode != "CSS1Compat" && window.attachEvent && document.all && document.getElementsByTagName )
		{
			var ss = document.styleSheets, auto, list, s, i;
			auto = new Array();
			list = new Array();
			s = this.getRules();
			
			for(i=0; i<s.length; i++)
				if( this.checkMargin(s[i][1]) )
					auto.push(s[i][0]);
			
			for(i=0; a = auto[i]; i++)
				ss[ss.length-1].addRule(a, "position : relative; left : expression( ( (this.parentNode.clientWidth > 0 ? this.parentNode.clientWidth : this.parentNode.offsetWidth) - this.offsetWidth) / 2);");
			this.list = auto;
			
			window.attachEvent("onload", IEmarginFix.checkInline);
		}
	},
	
	checkInline : function()
	{
		var i, a, elm, blk, list = new Array(), auto = IEmarginFix.list;
		for(i=0; a = auto[i]; i++)
		{
			if( a.charAt(0) == '.' )
				list = list.concat( IEmarginFix.getClass(a.substring(1)) );
			else if( a.charAt(0) == '#' )
				list.push( document.all[a.substring(1)] );
			else
				list = list.concat( document.getElementsByTagName(a) );
		}
		
		for(i=0; i<list.length; i++)
		{
			elm = list[i];
			if(elm)
			{
				blk = IEmarginFix.getStyle(elm, "display");
				if(blk != "block" && ( IEmarginFix.ie50 ? !IEmarginFix.ie50check(elm.tagName) : blk != "list-item" ) )
				{
					elm.style.position = "static";
					elm.style.left = "auto";
				}
			}
		}
	},
	
	checkMargin : function(str)
	{
		return (
			str.match(/margin\s*:\s*auto(;|$)/i) || str.match(/margin\s*:\s*\S+\s+auto(;|$)/i)
			|| ( str.match(/margin-left\s*:\s*auto(;|$)/i) && str.match(/margin-right\s*:\s*auto(;|$)/i) )
			|| str.match(/margin\s*:\s*\S+\s+auto\s+\S+(;|$)/i) || str.match(/margin\s*:\s*\S+\s+auto\s+\S+\s+auto(;|$)/i)
		);
	},
	
	/* these next few methods are basically for IE 5.0's bad interpretation of the "display" property
	(always returning "inline" unless explicitly set, even for block elements! */
	
	ie50 : navigator.appVersion.toLowerCase().indexOf("msie 5.0") != -1,
	
	ie50check : function(tag)
	{
		var i, r = false;
		tag = tag.toUpperCase();
		for(i=0; i<this.blockElms.length; i++)
			if(tag == this.blockElms[i])
				r = true;
		return r;
	},
	
	blockElms : new Array("ADDRESS", "BLOCKQUOTE", "BODY", "CENTER", "COL", "COLGROUP", "DD", "DIR", "DIV", "DL", "DT", "FIELDSET", "FORM", "FRAME", "HN", "HR", "IFRAME", "LEGEND", "LI", "LISTING", "MARQUEE", "MENU", "OL", "P", "PLAINTEXT", "PRE", "TABLE", "TBODY", "TD", "TFOOT", "TH", "THEAD", "TR", "UL", "XMP"),
	
	/* end IE5.0 detect */
	
	getClass : function(cls)
	{
		var el, r, i;
		el = document.all ? document.all : document.getElementsByTagName('*');
		r = new Array();
		for(i=0; el[i]; i++) if(el[i].className == cls) r.push(el[i]);
		if(r.length==0) r = null;
		return r;
	},
	
	getRules : function(wh)
	{
		var s = null;
		if(document.styleSheets && document.styleSheets.length)
		{
			var i, j, k, m, x, y, is = true;
			s = new Array();
			for(i=0; i < document.styleSheets.length; i++)
			{
				j = document.styleSheets.item(i);
				if(wh) is = (j.title || j.id) == wh;
				if(is)
				{
					if(j.cssRules) // mozilla
					{
						for(k=0; m = j.cssRules.item(k); k++)
						{
							if(m.styleSheet && m.styleSheet.cssRules.length) // imported sheets
								for(x=0; y = m.styleSheet.cssRules.item(x); x++) s.push([y.selectorText, y.style.cssText]);
							else s.push([m.selectorText, m.style.cssText])
						}
					}
					else if(j.rules) // explorer
					{
						if(j.imports && j.imports.length)
						{
							for(k=0; m = j.imports[k]; k++)
								for(x=0; y = m.rules[x]; x++)
									s.push([y.selectorText, y.style.cssText]);
						}
						for(k=0; m = j.rules[k]; k++)
								s.push([m.selectorText, m.style.cssText]);
					}
				}
				if(wh && is) break;
				else is = true;
			}
		}
		return s;
	},
	
	getStyle : function(obj,sty)
	{
		var sty2 = IEmarginFix.compactStyle(sty);
		var r = obj.style[sty2];
		if(r=='')
		{
			if(document.defaultView) r = document.defaultView.getComputedStyle(obj,'').getPropertyValue(sty);
			else r = obj.currentStyle[sty2];
		}
		if(!r) r = null;
		return r;
	},

	compactStyle : function(str)
	{
		var s = str.split('-');	var o = [s[0]];
		for(i=1;(j=s[i]);i++) { o[o.length] = j.charAt(0).toUpperCase(); o[o.length] = j.substring(1) };
		return o.join('');
	}
}

IEmarginFix.init();