if (ie||ns){ WinHeight=(ns)?window.innerHeight-20:window.document.body.clientHeight; WinWidth=(ns)?window.innerWidth-70:window.document.body.clientWidth; for (i=0; i < Amount; i++){ Speed[i]=(i+1)*6/Amount+4; //speed range from 4 to 10 Xpos[i] = (Math.random()*WinWidth-WinWidth/2)*(Amount-i/3)/Amount; Ypos[i] = (Math.random()*WinHeight-WinHeight/2)*(Amount-i/3)/Amount; Zpos[i] = Math.random()*900*(Amount-i/3)/Amount+100; } }