function iframeAutoHeight(){
	
	quem = document.getElementById('mainFrame')
    
	if(navigator.appName.indexOf("Internet Explorer") > -1) {
		
		var func_temp = function(){
            
			var val_temp = quem.contentWindow.document.body.scrollHeight + 5
            
			quem.style.height = val_temp + "px";

			var iframe = document.getElementById('ienquete')

		}
    
	setTimeout(function() { func_temp() },100)
    
	} else {
       var val = quem.contentWindow.document.body.parentNode.offsetHeight + 5
       quem.style.height= val + "px";
       var iframe=document.getElementById('mainFrame')
    } 
}
window.onload=function(){
	iframeAutoHeight()
}