pwImgSrcSwitch_onImages=new Array();

function pwImgSrcSwitch_Switch(imgName, imgSrc)
{
	pwImgSrcSwitch_onImages[imgName] = new Image();
	pwImgSrcSwitch_onImages[imgName].src = imgSrc;
}
function pwImgSrcSwitch_turnOn(imgName) 
{ 
	document.images[imgName].offSrc = document.images[imgName].src;
	document.images[imgName].src    = pwImgSrcSwitch_onImages[imgName].src;
} 
function pwImgSrcSwitch_turnOff(imgName) 
{ 
	document.images[imgName].src = document.images[imgName].offSrc;
}