function CheckImageFileType(controlID)
{

var bl=false;//用于判断是否符合要求
arrType=new Array(".jpg",".jpeg");
var v=document.getElementById(controlID).value;
v=v.toLowerCase();
arrType_length=arrType.length;
if(v!="")
{
for(var i=0 ;i<arrType_length;i++)
{
	if(v.indexOf(arrType[i])!=-1)
	{
		bl=true;
	}
}
if(!bl)
{
	document.getElementById(controlID).value="";
	alert("Uploaded file is not a valid image，Only .JPG files are allowed and max size within 1M");
}
}
else
{
alert("Please click Browe to upload your stone picture!");
}
return bl;

}