function pop(file)
{
  winContent = window.open(file, 'Message', 'right=0, top=0,width=650,height=650, toolbar=no,scrollbars=yes, resizable=yes')  
}
<!--
<!-- Beginning of JavaScript -
var x,y
var step=10
var flag=0

// Your snappy message. Important: the space at the end of the sentence!!!
var message="Green City-Clean City "
message=message.split("")
var xpos=new Array()
for (i=0;i<=message.length-1;i++) {
	xpos[i]=-50
}
var ypos=new Array()
for (i=0;i<=message.length-1;i++) {
	ypos[i]=-50
}
function handlerMM(e){
	x = (document.layers) ? e.pageX : event.clientX
	y = (document.layers) ? e.pageY : event.clientY
	flag=1
}
function makesnake() {



	
	if (flag==1 && document.all) {
    	for (i=message.length-1; i>=1; i--) {
   			xpos[i]=xpos[i-1]+step
			ypos[i]=ypos[i-1]
    	}
		xpos[0]=x+step
		ypos[0]=y
	
		for (i=0; i<message.length-1; i++) {
    		var thisspan = eval("document.all.span"+(i)+".style")
    		thisspan.posLeft=xpos[i]
			thisspan.posTop=ypos[i]
    	}
	}
	
	if (flag==1 && document.layers) {
    	for (i=message.length-1; i>=1; i--) {
   			xpos[i]=xpos[i-1]+step
			ypos[i]=ypos[i-1]
    	}
		xpos[0]=x+step
		ypos[0]=y
	
		for (i=0; i<message.length-1; i++) {
    		var thisspan = eval("document.span"+i)
    		thisspan.left=xpos[i]
			thisspan.top=ypos[i]
    	}
	}
		var timer=setTimeout("makesnake()",10)
}
// - End of JavaScript - -->
//-->


for (i=0;i<=message.length-1;i++) {
    document.write("<span id='span"+i+"' class='spanstyle'>")
	document.write(message[i])
    document.write("</span>")
}

if (document.layers){
	document.captureEvents(Event.MOUSEMOVE);
}
document.onmousemove = handlerMM;