function change(id, newClass) {
	 if (document.getElementById) {
 var identity=document.getElementById(id);
	identity.className=newClass;
 	} 
	}
	


function changeselected(selectobj){	
 if(selectobj.selectedIndex == 2) {
 	change('buyform','hide');change('rentform','hide');change('commform','show');
 	}
 else if(selectobj.selectedIndex == 1) {
 	change('buyform','hide');change('rentform','show');change('commform','hide');
 	}
 else if(selectobj.selectedIndex == 0) { 
	change('buyform','show');change('rentform','hide');change('commform','hide');
 }
}