function trimSpace(str)

{

  var i,j;

  if(str == "") return "";

  for(i=0;i<str.length;i++)

    if(str.charAt(i) != ' ') break;

  if(i >= str.length) return "";



  for(j=str.length-1;j>=0;j--)

    if(str.charAt(j) != ' ') break;



  return str.substring(i,j+1);

}

/* 

用途：检查输入字符串是否只由英文字母和数字组成 

输入： 

str：字符串 

返回： 

返回false 

*/ 

function str_en(str)

        {        

          if(!trimSpace(str).match(/^[a-zA-Z0-9]+$/i))

           {

             return false;             

           }

      }

/*

用途：检查数字并控制位数

str:字符串

返回：flase

*/	  

function str_int(str)

        {        

          if(!trimSpace(str).match(/[0-9]{6}/i))

           {

             return false;             

           }

      }

/*

用途：检查email地址

str:字符串

返回：flase

*/

function str_email(str)

        {        

          if(!trimSpace(str).match(/^[\w-]+(\.[\w-]+)*@[\w-]+(\.[\w-]+)+$/i))

           {

             return false;             

           }

      }

function chk_out()

{

		

var a=document.getElementById('Subject');

var b=document.getElementById('first');

var c=document.getElementById('last');

//var d=document.getElementById('company');



var e=document.getElementById('email');

//var f=document.getElementById('address');



var g=document.getElementById('city');



var h=document.getElementById('state');

var i=document.getElementById('zip');

//var j=document.getElementById('daytime');

//var k=document.getElementById('evening');

var l=document.getElementById('comments');



var error_a = "Require Fields must be entered!";

var error_b = "Require Fields must be entered!";

var error_c = "Require Fields must be entered!";

//var error_d = "The e-maill address you entered is not valid!";



var error_e = "The e-maill address you entered is not valid!";

//var error_f = "The e-maill address you entered is not valid!";



var error_g = "Require Fields must be entered!";

var error_h = "Require Fields must be entered!";

var error_i = "Require Fields must be entered!";

var error_l = "Require Fields must be entered!";



/**/





if(trimSpace(a.value).length==0||a.value=="contact_us.php"){

	alert(error_a);

	a.focus();

    return false;

	}



if(trimSpace(b.value).length==0){

	alert(error_b);

	b.focus();

    return false;

	}



if(trimSpace(c.value).length==0){

	alert(error_c);

	c.focus();

    return false;

	}

/*	

if((trimSpace(d.value).length==0)||(str_email(d.value)==false)){

	alert(error_d);

	d.focus();

    return false;

	}

*/	



if((trimSpace(e.value).length==0)||(str_email(e.value)==false)){

	alert(error_e);

	e.focus();

    return false;

	}



/*	

if((trimSpace(f.value).length==0&&trimSpace(e.value).length!=0)||(trimSpace(f.value).length!=0&&(str_email(f.value)==false))){

	alert(error_f);

	f.focus();

    return false;

	}

*//**/

if(trimSpace(g.value).length==0){

	alert(error_g);

	g.focus();

    return false;

	}



if(trimSpace(h.value).length==0){

	alert(error_h);

	h.focus();

    return false;

	}	

	if(trimSpace(i.value).length==0){

	alert(error_i);

	i.focus();

    return false;

	}

	if(trimSpace(l.value).length==0){

	alert(error_l);

	l.focus();

    return false;

	}

return true;

}