//取消拖动事件
//document.onselectstart=cancelevent;
function cancelevent()
{
	var tag=window.event.srcElement.tagName;
	if(tag=="INPUT"||tag=="TEXTAREA")
	{
		
	}
	else
	{
		window.event.cancelBubble=true;
		window.event.returnValue=false;
		return false;
	}
}

//预先加载图片
var imgpath="../common/";
var arrImg=new Array(4);
arrImg[0]=new Image();arrImg[0].src=imgpath+"common.gif";
arrImg[1]=new Image();arrImg[1].src=imgpath+"default.gif";
arrImg[2]=new Image();arrImg[2].src=imgpath+"down.gif";
arrImg[3]=new Image();arrImg[3].src=imgpath+"over.gif";

document.onmouseover=Doc_MouseOver;
function Doc_MouseOver()
{
	var obj=window.event.srcElement;
	//window.status=obj.tagName+"|"+obj.className;
	if(obj.className=="mysubmit"||obj.className=="mybutton")
	{
		obj.style.backgroundImage="URL('"+arrImg[3].src+"')";
	}
}

document.onmouseout=Doc_MouseOut;
function Doc_MouseOut()
{
	var obj=window.event.srcElement;
	switch(obj.className)
	{
		case "mybutton":
			obj.style.backgroundImage="URL('"+arrImg[0].src+"')";
			break;
		case "mysubmit":
			obj.style.backgroundImage="URL('"+arrImg[1].src+"')";
			break;
	}
}

document.onmousedown=Doc_MouseDown;
function Doc_MouseDown()
{
	var obj=window.event.srcElement;
	switch(obj.className)
	{
		case "mybutton":
		case "mysubmit":
			obj.style.backgroundImage="URL('"+arrImg[2].src+"')";
			break;
	}
}

document.onmouseup=Doc_MouseUp;
function Doc_MouseUp()
{
	var obj=window.event.srcElement;
	switch(obj.className)
	{
		case "mybutton":
		case "mysubmit":
			obj.style.backgroundImage="URL('"+arrImg[3].src+"')";
			break;
	}
}