/* 此程序为 网页设计排困解难 DIY (程秉辉 John Hawke 合着) 范例程序,详细使用说明请见该书 */
var fh_o=1;   // 透明变化方向旗标
var opacityMax,opacityMin,opacityNum,fshtime;

function init(objs,opacitya,opacityi,opacityn,ftime)
{
 objfsh=objs;
 opacityMax=opacitya; opacityMin=opacityi; fshtime=ftime; opacityNum=opacityn;
 setInterval("opacity_flash(objfsh)",fshtime);
}

function opacity_flash(picobj)
{
 if (picobj.filters.alpha.opacity >= opacityMax) {picobj.filters.alpha.opacity-=5; fh_o=0;}
 else {if (picobj.filters.alpha.opacity <= opacityMin) {picobj.filters.alpha.opacity+=5; fh_o=1;}
       if (fh_o == 0) picobj.filters.alpha.opacity-=opacityNum;
       if (fh_o == 1) picobj.filters.alpha.opacity+=opacityNum;
      }	
}