var Type = 'Z';
var delta = 1;

function StartFloat() {
if(document.all) {
	Type = 'A';
	}
else if(document.layers) {
	Type = 'B';
	}
else if(document.getElementById) {
	Type = 'C';
	}

setInterval('Float()', 50); 
}


function Float() {
if (Type == 'A') { 	actpos = document.body.scrollLeft; } 
else if (Type == 'B') { actpos = document.left; }
else if (Type == 'C') { actpos = window.pageXOffset; }

if (actpos == 720)
	delta = -1;
if (actpos == 20)
	delta = 1;

if (Type == 'A') { 	document.body.scrollLeft = document.body.scrollLeft + delta; } 
else if (Type == 'B') { document.left = document.left + delta; }
else if (Type == 'C') { window.scrollBy(delta,0); }

}