function countViewport(){
winHeight = $(window).height();
winWidth = $(window).width();
}

$(window).bind('resize', function(){
if ($(window).height() != winHeight
|| $(window).width() != winWidth) {
countViewport();
// TODO here
}
});

Thanks to your efforts I finally understand the cause of this problem.

However, this piece of Javascript will work fine too in most cases:

var wheight = 0;
var temp_height = 0;
var delay = 100;

function init(){
if(self.innerHeight)temp_height = self.innerHeight; //all except Explorer
else if(document.documentElement && document.documentElement.clientHeight)temp_height = document.documentElement.clientHeight; // Explorer 6 Strict Mode
else if(document.body)temp_height = document.body.clientHeight;// other Explorers
else temp_height = 430;
if(temp_height!=height)dosomething();
wheight = temp_height;
setTimeout('init()',delay);
}

window.onload = init;

Best regards, WN

Double check to be sure you're using the updated technique, which can be found here: The IE Resize Bug (Revisited). That blog post utilizes a better technique which I discovered after I posted this blog entry.

To the best of my knowledge, the newer technique works in all cases.