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From the <a href="http://lesscss.org/#-javascript-evaluation" rel="nofollow">docs</a>: <blockquote> However, if you still want to use JavaScript in .less, this is done by wrapping the expression with back-ticks: </blockquote> <pre><code>@var: `"hello".toUpperCase() + '!'`; </code></pre> So your line should be this (I think): <pre><code>@ievalue:`Math.floor(@alpha * 255).toString(16)`; </code></pre> And since you're using a variable inside, you might need to use <a href="http://lesscss.org/#-string-interpolation" rel="nofollow">string interpolation</a>, but then again, you might not, because your @alpha isn't inside a string. If that doesn't work, give this a try: <pre><code>@ievalue:`Math.floor(@{alpha} * 255).toString(16)`; </code></pre> That one looks funny, I think it's wrong. Hopefully the first one works. But it looks like you will need to use interpolation where you later do this: <pre><code>"...#@ievalue+@myred+@mygreen+@myblue..." </code></pre> Because you are inside a string on the last line of your example code, I think that should be: <pre><code>"...#@{ievalue}+@{myred}+@{mygreen}+@{myblue}..." </code></pre> As for your latest question, you probably need to use this other bit called Escaping: <blockquote> <a href="http://lesscss.org/#-escaping" rel="nofollow">Escaping</a> Sometimes you might need to output a CSS value which is either not valid CSS syntax, or uses proprietary syntax which LESS doesn’t recognize. To output such value, we place it inside a string prefixed with ~, for example: </blockquote> <pre><code>.class { filter: ~"ms:alwaysHasItsOwnSyntax.For.Stuff()"; } </code></pre> So your last two lines should probably be this: <pre><code>filter: ~"progid:DXImageTransform.Microsoft.gradient(startColorstr=#@{ievalue}+@{myred}+@{mygreen}+@{myblue}, endColorstr=#@{ievalue}+@{myred}+@{mygreen}+@{myblue})"; /* For IE 8*/ -ms-filter: ~"progid:DXImageTransform.Microsoft.gradient(startColorstr=#@{ievalue}+@{myred}+@{mygreen}+@{myblue}, endColorstr=#@{ievalue}+@{myred}+@{mygreen}+@{myblue})"; </code></pre> I found <a href="http://www.thebrightlines.com/2011/11/25/filter-styles-in-less/" rel="nofollow">this very brief example</a> to back it up, but again, I haven't tried it.
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