var objmain = document.getElementById("main");
function updatesize(){ 
	var bodyw = window.document.body.offsetWidth; 
	
	//if(bodyw <= 790) objmain.style.width="772px"; 
	//else if(bodyw >= 1016) objmain.style.width="996px"; else objmain.style.width="100%";
	
	 objmain.style.width="100%"; 
}
updatesize(); window.onresize = updatesize;