var ROLL_PRE="";
function plRollOver(imgName,outSrc,overSrc,inSrc) {
	this.overImg=new Image();
	this.overImg.src=ROLL_PRE+overSrc;
	this.outImg=new Image();
	this.outImg.src=ROLL_PRE+outSrc;
	this.inImg=new Image();
	this.inImg.src=ROLL_PRE+inSrc;
	this.linkedimg=imgName;
	this.src=ROLL_PRE+outSrc;
	this.inflag=false;
}
plRollOver.prototype.RollOver = function () {
	if (this.inflag==false) document[this.linkedimg].src=this.overImg.src;
}
plRollOver.prototype.RollOut = function () {
	if (this.inflag==false) document[this.linkedimg].src=this.outImg.src;
}
plRollOver.prototype.RollIn = function () {
	document[this.linkedimg].src=this.inImg.src;
	this.inflag=true;
}