var oMarquee3 = document.getElementById("mq3"); //滚动对象
var iLineHeight3 = 38; //单行高度，像素 
var iLineCount3 = 2; //实际行数 
var iScrollAmount3 = 1; //每次滚动高度，像素 

function run3() { 
oMarquee3.scrollTop += iScrollAmount3; 
if ( oMarquee3.scrollTop == iLineCount3 * iLineHeight3 ) 
oMarquee3.scrollTop = 0;
if ( oMarquee3.scrollTop % iLineHeight3 == 0 ) { 
window.setTimeout( "run3()", 8000 ); 
} else { 
window.setTimeout( "run3()", 60 ); 
} 
} 

oMarquee3.innerHTML += oMarquee3.innerHTML; 
window.setTimeout( "run3()", 8000 );