var myWidth=0;if(typeof(window.innerWidth)=='number'){myWidth=window.innerWidth;}else if(document.documentElement&&(document.documentElement.clientWidth)){myWidth=document.documentElement.clientWidth;}else if(document.body&&(document.body.clientWidth)){myWidth=document.body.clientWidth;}
function widthCheck(){if(myWidth>=1280){document.getElementById("bg_left").style.visibility="visible";document.getElementById("bg_right").style.visibility="visible";}}