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

IEmarginFix =
{
	run : null,
	
	kill : function()
	{
		clearTimeout("IEmarginFix.run");
	},
	
	init : function()
	{
		var valid = navigator.userAgent.toLowerCase().indexOf('mac') == -1 && document.all && document.getElementsByTagName && document.compatMode != "CSS1Compat";
		if(!valid) return;
		var ss = document.styleSheets;
		var auto, list, s, i, elm, expr, blk;
		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.offsetWidth - this.offsetWidth) / 2);");
		}
		this.list = auto;
		
		if(window.attachEvent) 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" ) ) // check for existence and block 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;
		tag = tag.toUpperCase();
		for(i=0; i<this.blockElms.length; i++)
			if(tag == this.blockElms[i])
				return true;
		return false;
	},
	
	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) return r;
		else return null;
	},
	
	getRules : function(wh) // grabs all the styles
	{
		if(document.styleSheets && document.styleSheets.length)
		{
			var i, j, k, m, x, y, s = new Array(), is = true;
			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 || null;
	},
	
	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) return r; else return null;
	},

	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();