var loaded=false;
var self=Array();
var iPath='images/';

function preLoad()
{
	if(document.images)
	{
		var suffix=Array('a','b');
		var iExt='gif';
		var argLen = arguments.length;

		for(i=0;i<argLen;i++)
		{
			var arg = arguments[i];
			var sufLen = suffix.length;
			for(j=0;j<sufLen;j++)
			{
				var suf = suffix[j]
				self[arg + '_' + suf] = new Image();
				self[arg + '_' + suf].src = iPath + arg + '_' + suf + '.' + iExt;
			}
		}
		loaded = true;
	}
}

function rollOver(iFile,iState,iName)
{
	if(document.images && loaded)
	{
		if(!iName) iName=iFile;
		document.images[iName].src = self[iFile + '_' + iState].src;
	}
}