function residential()
{
//2
var ranNum= Math.round(Math.random() * 2);
if (ranNum == 0){document.write('<img src="ResidentialGraphics/House1.jpg">'); } // res1
if (ranNum == 1){document.write('<img src="ResidentialGraphics/House2.jpg">'); } // res2
if (ranNum == 2){document.write('<img src="ResidentialGraphics/House3.jpg">'); } // res3
}