window.onload=function(){picSwitch();}
function de(){return document.getElementById(arguments[0]) || false;}
function picSwitch(){
	var picObj=de('js1').getElementsByTagName('img')[0];
	var btnObj=de('js2').getElementsByTagName('ul')[0].getElementsByTagName('img');
	for(var i=0,j=btnObj.length;i<j;i++){
		btnObj[i].onmouseover=function(){
			var picSrcArray=this.src.split('/');
			var picSrcStr=picSrcArray[picSrcArray.length-1];
			switch(picSrcStr){
				case 'Domestic-granite_01.jpg':picObj.src='images/Domestic-granite_1.jpg';break;
				case 'Domestic-granite_02.jpg':picObj.src='images/Domestic-granite_2.jpg';break;
				case 'Domestic-granite_03.jpg':picObj.src='images/Domestic-granite_3.jpg';break;
				case 'Import-granite_01.jpg':picObj.src='images/Import-granite_1.jpg';break;
				case 'Import-granite_02.jpg':picObj.src='images/Import-granite_2.jpg';break;
				case 'Import-granite_03.jpg':picObj.src='images/Import-granite_3.jpg';break;
				default:picObj.src='Domestic-granite_1.jpg';
			}
		}
	}
}