function ResetImg(img,imgWidth,imgHeight){
	var image = new Image();
	image.src = img.src;
	if(image.width>imgWidth || image.height>imgHeight){
		var var1=image.width/image.height;
		var var2=imgWidth/imgHeight;
		if(var1>var2){
			img.width=imgWidth;
		}
		else{
			img.height=imgHeight;
		}
	}
}
function checkSpaces(value){
	var str="";
	for(i=0;i<value.length;i++){
		str=str+" ";
	}
	if(str==value){
		return true;
	}
	return false;
}
//检查文本域是否为空并获得焦点
function check(Obj,Msg){
	if(checkSpaces(Obj.value,Msg)){
		alert(Msg);
		Obj.focus();
		return true;
	}
}
function checkEmail(ObjEmail){
    var myreg = /^([a-zA-Z0-9]+[_|\_|\.]?)*[a-zA-Z0-9]+@([a-zA-Z0-9]+[_|\_|\.]?)*[a-zA-Z0-9]+\.[a-zA-Z]{2,3}$/;    //对电子邮件的验证
    if(!myreg.test(ObjEmail.value)){
    	alert('提示\n\n请输入有效的E_mail！');
	    ObjEmail.focus();
    	return true;//不是符合格式的Email
    }
}
function checkEmailEn(ObjEmail){
    var myreg = /^([a-zA-Z0-9]+[_|\_|\.]?)*[a-zA-Z0-9]+@([a-zA-Z0-9]+[_|\_|\.]?)*[a-zA-Z0-9]+\.[a-zA-Z]{2,3}$/;    //对电子邮件的验证
    if(!myreg.test(ObjEmail.value)){
    	alert('Prompt \n\nPlease enter a valid E_mail！');
	    ObjEmail.focus();
    	return true;//不是符合格式的Email
    }
}