Примеры: 
 1)http://gigabytes2.clan.su/index....0-4 
 2)http://gigabytes2.clan.su/index....0-6 
 Вот сам код: 
 Код
<body><style>       
 <!--       
 .intro{       
 position:absolute;       
 left:0;       
 top:0;       
 layer-background-color:black;       
 background-color:black;       
 border:0.1px solid black;       
 z-index:9;       
 }       
 -->       
 </style>       
 <div id="i1" class="intro"></div><div id="i2" class="intro"></div>       
 <script language="JavaScript1.2">       
 /*       
 Left-Right Curtain Script- © Dynamic Drive (www.dynamicdrive.com)       
 For full source code, 100's more free DHTML scripts, and TOS,       
 visit http://dynamicdrive.com       
 */       
 var ns4=document.layers?1:0       
 var ie4=document.all?1:0       
 var ns6=document.getElementById&&!document.all?1:0       
 var speed=20       
 var temp=new Array()       
 var temp2=new Array()       
 if (ns4){       
 for (i=1;i<=2;i++){       
 temp[i]=eval("document.i"+i+".clip")       
 temp2[i]=eval("document.i"+i)       
 temp[i].width=window.innerWidth/2       
 temp[i].height=window.innerHeight       
 temp2[i].left=(i-1)*temp[i].width       
 }       
 }       
 else if (ie4||ns6){       
 var clipright=ns6?window.innerWidth/2*0.98:document.body.clientWidth/2,clipleft=0       
 for (i=1;i<=2;i++){       
 temp[i]=ns6?document.getElementById("i"+i).style:eval("document.all.i"+i+".style")       
 temp[i].width=ns6?window.innerWidth/2*0.98:document.body.clientWidth/2       
 temp[i].height=ns6?window.innerHeight-1: document.body.offsetHeight       
 temp[i].left=(i-1)*parseInt(temp[i].width)       
 }       
 }       
 function openit(){       
 window.scrollTo(0,0)       
 if (ns4){       
 temp[1].right-=speed       
 temp[2].left+=speed       
 if (temp[2].left>window.innerWidth/2)       
 clearInterval(stopit)       
 }       
 else if (ie4||ns6){       
 clipright-=speed       
 temp[1].clip="rect(0 "+clipright+" auto 0)"       
 clipleft+=speed       
 temp[2].clip="rect(0 auto auto "+clipleft+")"       
 if (clipright<=0){       
 clearInterval(stopit)       
 if (ns6){       
 temp[1].display="none"       
 temp[2].display="none"       
 }       
 }       
 }       
 }       
 function gogo(){       
 stopit=setInterval("openit()",100)       
 }       
 gogo()       
 </script><body>
 Вы можете менять цвета сами, в данном коде установлен красный цвет, ниже я приведу пример с черным цветом! 
 Код
<body><style>       
 <!--       
 .intro{       
 position:absolute;       
 left:0;       
 top:0;       
 layer-background-color:red;       
 background-color:red;       
 border:0.1px solid red;       
 z-index:9;       
 }       
 -->       
 </style>       
 <div id="i1" class="intro"></div><div id="i2" class="intro"></div>       
 <script language="JavaScript1.2">       
 /*       
 Left-Right Curtain Script- © Dynamic Drive (www.dynamicdrive.com)       
 For full source code, 100's more free DHTML scripts, and TOS,       
 visit http://dynamicdrive.com       
 */       
 var ns4=document.layers?1:0       
 var ie4=document.all?1:0       
 var ns6=document.getElementById&&!document.all?1:0       
 var speed=20       
 var temp=new Array()       
 var temp2=new Array()       
 if (ns4){       
 for (i=1;i<=2;i++){       
 temp[i]=eval("document.i"+i+".clip")       
 temp2[i]=eval("document.i"+i)       
 temp[i].width=window.innerWidth/2       
 temp[i].height=window.innerHeight       
 temp2[i].left=(i-1)*temp[i].width       
 }       
 }       
 else if (ie4||ns6){       
 var clipright=ns6?window.innerWidth/2*0.98:document.body.clientWidth/2,clipleft=0       
 for (i=1;i<=2;i++){       
 temp[i]=ns6?document.getElementById("i"+i).style:eval("document.all.i"+i+".style")       
 temp[i].width=ns6?window.innerWidth/2*0.98:document.body.clientWidth/2       
 temp[i].height=ns6?window.innerHeight-1: document.body.offsetHeight       
 temp[i].left=(i-1)*parseInt(temp[i].width)       
 }       
 }       
 function openit(){       
 window.scrollTo(0,0)       
 if (ns4){       
 temp[1].right-=speed       
 temp[2].left+=speed       
 if (temp[2].left>window.innerWidth/2)       
 clearInterval(stopit)       
 }       
 else if (ie4||ns6){       
 clipright-=speed       
 temp[1].clip="rect(0 "+clipright+" auto 0)"       
 clipleft+=speed       
 temp[2].clip="rect(0 auto auto "+clipleft+")"       
 if (clipright<=0){       
 clearInterval(stopit)       
 if (ns6){       
 temp[1].display="none"       
 temp[2].display="none"       
 }       
 }       
 }       
 }       
 function gogo(){       
 stopit=setInterval("openit()",100)       
 }       
 gogo()       
 </script><body>
 Так теперь разберемся. 
      
 Код
layer-background-color:red; >>>> меняем на свой цвет     
 background-color:red;     >>>> меняем на свой цвет     
 border:0.1px solid red;     >>>> меняем на свой цвет
 Вот и все!