function autoHeigth() {

	if ( 

		document.getElementById('left').clientHeight > 

		document.getElementById('center').clientHeight 

	) {

		//alert("es mayor el derecho: " + document.getElementById('maincontentright').clientHeight);

		   document.getElementById('center').style.height = 

	   window.document.getElementById('left').clientHeight + 'px';

	}

	else {

		//alert("es mayor el content: " + document.getElementById('maincontent').clientHeight );

		   document.getElementById('left').style.height = 

	   window.document.getElementById('center').clientHeight + 'px';		

	}   

}