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',
	    b       = document.createElement('B'),
	    docElem = document.documentElement,
	    isIE;
	    
	if(version){
		cc = (comparison ? comparison + ' ' : '') + cc + ' ' + version;
	}
	
	b.innerHTML = '<!--[if '+ cc +']><b id="iecctest"></b><![endif]-->';
	docElem.appendChild(b);
	isIE = !!document.getElementById('iecctest');
	docElem.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');