function changeHeightFrame(id)
{
	var o=document.getElementById(id);
	var mt=getActiveStyle(o.contentWindow.document.body,'margin-top');
	var mb=getActiveStyle(o.contentWindow.document.body,'margin-bottom');
	o.height = o.contentWindow.document.body.scrollHeight
				+ Number(mt.match(/[0-9]+/g))
				+ Number(mb.match(/[0-9]+/g));
}

String.prototype.camelize = 
function() {
	return this.replace(/-([a-z])/g,function($0,$1){return $1.toUpperCase()});
}

String.prototype.deCamelize = 
function() {
	return this.replace(/[A-Z]/g,function($0){return "-"+$0.toLowerCase()});
}

function getActiveStyle(element,property,pseudo)
{
	if (element.currentStyle){ //IE or Opera
		if(property.indexOf("-")!=-1) property=property.camelize();
		return element.currentStyle[ property ];
	} else if( getComputedStyle ) {//Mozilla or Opera
		if(property.indexOf("-")==-1) property=property.deCamelize();
		return getComputedStyle(element,pseudo).getPropertyValue(property);
	}
	return "";
}

window.onload=function()
{
	changeHeightFrame("fr"); 
}