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function hasClass( elements,cName ){ return !!elements.className.match( new RegExp( "(\\s|^)" + cName + "(\\s|$)") ); }; function addClass( elements,cName ){ if( !hasClass( elements,cName ) ){ elements.className += " " + cName; }; }; function removeClass( elements,cName ){ if( hasClass( elements,cName ) ){ elements.className = elements.className.replace( new RegExp( "(\\s|^)" + cName + "(\\s|$)" ), " " ); }; }; var curIdx2 = 0; var dyn_pics2 = document.getElementsByClassName('dyn_pic2'); var lastIdx2 = dyn_pics2.length - 1; function turn_cur_pic2() { removeClass(dyn_pics2[lastIdx2], 'turn_pic2'); dyn_pics2[lastIdx2].parentElement.style.backgroundImage = "url(" + dyn_pics2[lastIdx2].src + ")"; dyn_pics2[lastIdx2].parentElement.style.backgroundSize = "cover"; addClass(dyn_pics2[curIdx2], 'turn_pic2' ); lastIdx2 = curIdx2; curIdx2++; curIdx2 %= dyn_pics2.length; setTimeout(turn_cur_pic2, 6000); } turn_cur_pic2();