function yx_bg(n) {   
 n.background="img/i_topselected.gif";
 if (n==yx1) {
  if(document.form1.which.Value=="all")
    {
     document.form1.which.Selected=true;
     return;
    }else{
     document.form1.which.Selected=false;
  	} 
  document.form1.key.value="all";   
  document.form1.word.value="输入关键字";   
  document.form1.word.style.color="#999999";   
  line2.style.display="";   
  line3.style.display="";   
  line4.style.display="";   
  line5.style.display="";   
  line6.style.display="";   
  line1.style.display="none";   
  line0.style.display="none";   
  line7.style.display="";
  yx1.background=""; 
  yx2.background="";   
  yx3.background="";   
  yx4.background="";   
  yx5.background="";   
  yx6.background="";    
 }       
 if (n==yx1) {
 n.background="img/i_topselected.gif";
  if(document.form1.which.Value=="sca")
    {
     document.form1.which.sca.Selected=true;
     return;
    }else{
     document.form1.which.Selected=false;
  	} 
  document.form1.key.value="sca";   
  document.form1.word.value="输入商业机会信息";   
  document.form1.word.style.color="#999999";   
  line2.style.display="none";   
  line3.style.display="";   
  line4.style.display="";   
  line5.style.display="";   
  line6.style.display="";   
  line1.style.display="none";   
  line0.style.display="";   
  line7.style.display="";
  yx0.background=""; 
  yx2.background="";   
  yx3.background="";   
  yx4.background="";   
  yx5.background="";   
  yx6.background="";   
 }   
  if (n==yx2) {  
  if(document.form1.which.Value=="cp")
    {
     document.form1.which.Selected=true;
     return;
    }else{
     document.form1.which.Selected=false;
  	} 
  document.form1.key.value="cp";   
  document.form1.word.value="输入产品名称";   
  document.form1.word.style.color="#999999";   
  line2.style.display="none";   
  line1.style.display="";   
  line0.style.display="";   
  line3.style.display="none";   
  line4.style.display="";   
  line5.style.display="";   
  line6.style.display=""; 
  line7.style.display=""; 
  yx0.background="";   
  yx1.background="";   
  yx3.background="";   
  yx4.background="";   
  yx5.background="";   
  yx6.background=""; 
 } 
 if (n==yx3) {  
  if(document.form1.which.Value=="yp")
    {
     document.form1.which.Selected=true;
     return;
    }else{
     document.form1.which.Selected=false;
  	} 
  document.form1.key.value="yp";   
  document.form1.word.value="输入公司名称";   
  document.form1.word.style.color="#999999";   
  line3.style.display="none";   
  line2.style.display="";   
  line0.style.display="";   
  line1.style.display="";   
  line4.style.display="none";   
  line5.style.display="";   
  line6.style.display="";  
  line7.style.display="";  
  yx0.background=""; 
  yx1.background="";   
  yx2.background="";   
  yx4.background="";   
  yx5.background="";   
  yx6.background="";    
 }   
 if (n==yx4) {   
 if(document.form1.which.Value=="hy")
    {
     document.form1.which.Selected=true;
     return;
    }else{
     document.form1.which.Selected=false;
  	} 
  document.form1.which.Selected=true;
  document.form1.key.value="hy";   
  document.form1.word.value="输入行业信息";   
  document.form1.word.style.color="#999999";   
  line4.style.display="none";   
  line3.style.display="";   
  line2.style.display="";   
  line0.style.display="";   
  line1.style.display="";   
  line5.style.display="none";   
  line6.style.display=""; 
  line7.style.display="";  
  yx0.background="";  
  yx1.background="";   
  yx3.background="";   
  yx2.background="";   
  yx5.background="";   
  yx6.background="";   
 }   
 if (n==yx5) {  
 if(document.form1.which.Value=="news")
    {
     document.form1.which.Selected=true;
     return;
    }else{
     document.form1.which.Selected=false;
  	} 
  document.form1.key.value="news";   
  document.form1.word.value="企业资讯标题或者内容";   
  document.form1.word.style.color="#999999";   
  line5.style.display="none";   
  line4.style.display="";   
  line2.style.display="";   
  line1.style.display="";   
  line3.style.display="";   
  line0.style.display="";   
  line6.style.display="none"; 
  line7.style.display="";  
  yx0.background=""; 
  yx1.background="";   
  yx3.background="";   
  yx4.background="";   
  yx2.background="";   
  yx6.background="";   
 }   
 if (n==yx6) {   
 if(document.form1.which.Value=="zh")
   {
     document.form1.which.Selected=true;
     return;
    }else{
     document.form1.which.Selected=false;
  	} 
  document.form1.key.value="zh";   
  document.form1.word.value="输入展会信息";   
  document.form1.word.style.color="#999999";   
  line6.style.display="none";   
  line5.style.display="";   
  line2.style.display="";   
  line1.style.display="";   
  line0.style.display="";   
  line4.style.display="";   
  line3.style.display="";  
  line7.style.display="none";  
  yx0.background=""; 
  yx1.background="";   
  yx3.background="";   
  yx4.background="";   
  yx5.background="";   
  yx2.background="";   
 }   
}

function DoLogin() {

var UsernameGet = trim(document.loginForm.UsernameGet.value);
var PasswordGet = trim(document.loginForm.PasswordGet.value);
var Verifycode = trim(document.loginForm.Verifycode.value);

if(UsernameGet == "") {
alert("请输入会员登录名！");
document.loginForm.UsernameGet.focus();
return false;
} 
if(PasswordGet == "") {
alert("请输入密码！");
document.loginForm.PasswordGet.focus();
return false;
} 
if(Verifycode == "") {
alert("请输入验证码！");
document.loginForm.Verifycode.focus();
return false;
}  


}

function trim(inputString) {

  if (typeof inputString != "string") { return inputString; }
  var retValue = inputString;
  var ch = retValue.substring(0, 1);
  while (ch == " ") { 
  //检查字符串开始部分的空格
	  retValue = retValue.substring(1, retValue.length);
	  ch = retValue.substring(0, 1);
  }
  ch = retValue.substring(retValue.length-1, retValue.length);
  while (ch == " ") {
	 //检查字符串结束部分的空格
	 retValue = retValue.substring(0, retValue.length-1);
	 ch = retValue.substring(retValue.length-1, retValue.length);
  }
  while (retValue.indexOf("  ") != -1) { 
 //将文字中间多个相连的空格变为一个空格
	 retValue = retValue.substring(0, retValue.indexOf("  ")) + retValue.substring(retValue.indexOf("  ")+1, retValue.length); 
  }
  return retValue;
}