function $geId(quem){
//apelido só pra não ficar repetindo o document.getElementById
return document.getElementById(quem)
}
/************************
* Setar variaveis globais
*************************/
var _heightLim = 600;
var height = 0;
var SiteInst={};
SiteInst.getHeightWin = function() {
	if (self.innerHeight) // todos, exceto Explorer
		height = self.innerHeight;
	else if (document.documentElement && document.documentElement.clientHeight) // Explorer 6 "Strict Mode"
		height = document.documentElement.clientHeight;
	else if (document.body) // demais Explorers
		height = document.body.clientHeight;
	return height;
};
SiteInst.setResizeHeight = function(){
   _iframe = document.getElementById('iframePrincipal');
	if (document.all||document.documentElement) { // páginas internas (IE)
		height = SiteInst.getHeightWin(); // sem scroll
		if (height < _heightLim) {
			_iframe.style.height= height+"px";
			_iframe.style.overflowX = "visible";
		}
	}
}

// Executa a Função setResizeHeight ao carregar a página
if (window.addEventListener)
	window.addEventListener('load', SiteInst.setResizeHeight, false);
else if (window.attachEvent)
	window.attachEvent('onload', SiteInst.setResizeHeight);
else
	window.onload = SiteInst.setResizeHeight;