Drop down menu problem in IE8, FF

[kevinmeads]

Hi,
I have a drop down menu that works fine in IE7 but wont center on the page in iE8 or FF.
Can anybody spot what I am doing wrong?
many thanks
Kev

Here is the CSS

/* Begin CSS Drop Down Menu */

#menuh-container
	{
	position: center;		
	top: .2em;
	right: 0em;
	}

#menuh
	{
	font-size: 12px;
	font-family: arial, helvetica, sans-serif;
	width:100%;
	float:center;
	margin:2em;
	margin-top: 1em;
	margin: 1px 2px 50px 0;
	margin: 0;
	}
		
#menuh a
	{
	text-align: center;
	display:block;
	border: 1px solid #fff;
	white-space:nowrap;
	margin:0;
	padding: .3em;
	}
	
#menuh a:link, #menuh a:visited, #menuh a:active	/* menu at rest */
	{
	color: black;
	background-color: #ffffff;
	text-decoration:none;
	}
	
#menuh a:hover						/* menu on mouse-over  */
	{
	color: black;
	background-color: #cdde86;
	text-decoration:none;
	}	
	
#menuh a.top_parent, #menuh a.top_parent:hover  /* attaches down-arrow to all top-parents */
	{
/*	background-image: url(images/navdown_white.gif); */
	background-position: right center;
	background-repeat: no-repeat;
	}
	
#menuh a.parent, #menuh a.parent:hover 	/* attaches side-arrow to all parents */
	{
	background-image: url(images/nav_white.gif);
	background-position: right center;
	background-repeat: no-repeat;
	}

#menuh ul
	{
	list-style:none;
	margin:0;
	padding:0;
	float:left;
	width:6.6em;	/* width of all menu boxes */
	/* NOTE: For adjustable menu boxes you can comment out the above width rule.
	However, you will have to add padding in the "#menh a" rule so that the menu boxes
	will have space on either side of the text -- try it */
	}

#menuh li
	{
	position:relative;
	min-height: 1px;		/* Sophie Dennis contribution for IE7 */
	vertical-align: bottom;		/* Sophie Dennis contribution for IE7 */
	}

#menuh ul ul
	{
	position:absolute;
	z-index:500;
	top:auto;
	display:none;
	padding: 1em;
	margin:-1em 0 0 -1em;
	}

#menuh ul ul ul
	{
	top:0;
	left:100%;
	}

div#menuh li:hover
	{
	cursor:pointer;
	z-index:100;
	}

div#menuh li:hover ul ul,
div#menuh li li:hover ul ul,
div#menuh li li li:hover ul ul,
div#menuh li li li li:hover ul ul
{display:none;}

div#menuh li:hover ul,
div#menuh li li:hover ul,
div#menuh li li li:hover ul,
div#menuh li li li li:hover ul
{display:block;}

/* End CSS Drop Down Menu */

[auntnini]

The 4 possible CSS values for POSIION property are static (default HTML flow), fixed, relative, or absolute (out of HTML flow). See http://www.w3schools.com/css/css_positioning.asp. (For HTML 4 and CSS 2 or 3 anyhow, there is no position: center.)

You can use margin right/left "auto" (with text-align: center for IE) to center a div, etc. When using UL/LI for horizontal navigation buttons, it seems impossible to center them because you float them and display: inline. I cannot put my finger on some of the proposed solutions

[simcomedia]

This section:

#menuh-container
{
position: center;
top: .2em;
right: 0em;
}


As auntnini pointed out, there's no position: center; setting in CSS. To center that container you need to do the following:

#menuh-container
{
width: 800px; /* needs a width to determine where to put it */
margin: auto;
padding: 0;

}

top: .2em; /* this would only apply if using position: absolute; */
right: 0em; /* same with this, don't need them */

If you want some margin at the top then do this:

margin: .2em auto;

The 'auto' will do the centering left-right for you.