window.onresize = function(event) {
    checkScreen();
}
    
function checkScreen(){
	
	if (parseInt(navigator.appVersion)>3) {
		 if (navigator.appName=="Netscape") {
		  winW = window.innerWidth;
		  winH = window.innerHeight;
		  clientWidth = screen.width;
		 }
		 if (navigator.appName.indexOf("Microsoft")!=-1) {
		  winW = document.body.offsetWidth;
		  winH = document.body.offsetHeight;
		  clientWidth = document.documentElement.clientWidth
		 }
	}
	
	
	iWidthOptimum = 1120;
	iWidthRight = '0px';
	//alert('clientWidth: '+clientWidth);
	//alert('winW: '+winW);
	
	if (clientWidth < iWidthOptimum || winW < iWidthOptimum){
		iWidthRight = iWidthOptimum  + 'px';
	}else if(winW >= iWidthOptimum ){
		iWidthRight = '100%';
	}
	document.getElementById('tablacabecera').style.width = iWidthRight;
	document.getElementById('tablamenu').style.width = iWidthRight;
	document.getElementById('tablacontenido').style.width = iWidthRight;
	document.getElementById('tablabottom1').style.width = iWidthRight;
	document.getElementById('tablabottom2').style.width = iWidthRight;
	document.getElementById('tablabottom3').style.width = iWidthRight;
	document.getElementById('tablabottom4').style.width = iWidthRight;


}