detect IE and version number through injected conditional comments.js

//EnhanceJS isIE test idea

//detect IE and version number through injected conditional comments (no UA detect, no need for cond. compilation / jscript check)

//version arg is for IE version (optional)
//comparison arg supports 'lte', 'gte', etc (optional)

function isIE(version, comparison) {
	var cc = 'IE';
	if(version){
		cc += ' ' + version;
		if(comparison){ cc = comparison +' '+ cc; }
	}
	var b = document.createElement('B');
	b.innerHTML = '<!--[if '+ cc +']><b id="iecctest"></b><![endif]-->';
	document.documentElement.appendChild(b);
	var isIE = document.getElementById('iecctest');
	document.documentElement.removeChild(b);
	return !!isIE;
}
		
//is it IE?		
isIE(); 

//is it IE6?
isIE(6);

//is it less than or equal to IE 6?
isIE(7,'lte');