GetRandomNumber = function(numLow,numHigh)
{
	var adjustedHigh = (parseFloat(numHigh) - parseFloat(numLow)) + 1;
	return Math.floor(Math.random()*adjustedHigh) + parseFloat(numLow);
}

$(document).ready(function() 
{
	var numOfMechImagesInFolder = 4;
	var numOfBioImagesInFolder = 5;
	
	var MechImage = $("#MechImage");
	var BioImage = $("#BioImage");
	
	if(MechImage.length > 0)
	{
		var randNum = GetRandomNumber(1,numOfMechImagesInFolder);
		MechImage.attr("src","/images/photos/mech/mech" + randNum + ".jpg");
		MechImage.attr("alt","Wastewater screens and wastewater screening equipment");
	}
	
	if(BioImage.length > 0)
	{
		var randNum = GetRandomNumber(1,numOfBioImagesInFolder);
		BioImage.attr("src","/images/photos/bio/bio" + randNum + ".jpg");	
		BioImage.attr("alt","Biological wastewater treatment solutions (MBBR/IFAS)");
	}
});