var oMarquee = document.getElementById("mq"); //滚动对象
var iLineHeight = 24; //单行高度，像素
var iLineCount = 18; //实际行数
var iScrollAmount = 1; //每次滚动高度，像素
function run() {
oMarquee.scrollTop += iScrollAmount;
if ( oMarquee.scrollTop == iLineCount * iLineHeight )
oMarquee.scrollTop = 0;
if ( oMarquee.scrollTop % iLineHeight == 0 ) {
window.setTimeout( "run()", 2000 );
} else {
window.setTimeout( "run()", 50 );
}
}
oMarquee.innerHTML += oMarquee.innerHTML;
window.setTimeout( "run()", 2000 );