function ContentHeight(){
  document.getElementById('leftzone').style.height = viewportGetHeight()+"px";
  //document.getElementById('content').style.height = viewportGetHeight()+"px";
}

function ContentHeight2(){
	if (document.getElementById('leftzone').offsetHeight){
		var divHeight = document.getElementById('leftzone').offsetHeight;
	}
		if (navigator.userAgent.match(/MSI/)) {
			var minheight = 900;
		}
		else { var minheight = 700; }
	if ((divHeight <= minheight) && (divHeight <= viewportGetHeight())){
  	document.getElementById('leftzone').style.height = viewportGetHeight()+"px";
  }
  	if (divHeight >= viewportGetHeight()){
  	document.getElementById('leftzone').style.height = divHeight +"px";
  }
}

function viewportGetHeight() {
    var retval = 0;
    if (window.innerHeight)
        retval = window.innerHeight - 202;
    else if (document.documentElement && document.documentElement.clientHeight) 
        retval = document.documentElement.clientHeight;
    else if (document.body && document.body.clientHeight) 
        retval = document.body.clientHeight;

    return retval;    
}

function init() {
	ContentHeight();
}

window.onload = init;