/* For IE*/
html{
	font-size:100%;
}

/* Ensures iem = 10px */

/* For IE - If we use px it won't allow resizing*/
body{
	font-size:62.5%;
}

/* for Others - IE won't use the descendant selector*/
html>body {
	font-size:10px;
}

/* Ensure form controls and tables inherit their parent's size */
input, select, th, td {
	font-size:1em;
}

/* 

So Now 1em = 10px, 1.4em = 14px etc 

And For nested elements:

childPix / parentPix = childEms

10/16 = 0.65em

See http://clagnut.com/blog/348/

*/