load page in iframe

i need to know how to load web pages into my iframe by clicking links in my dropdown menu.  



var NoOffFirstLineMenus=5;                  // Number of first level items
      var LowBgColor='white';                  // Background color when mouse is not over
      var LowSubBgColor='white';                  // Background color when mouse is not over on subs
      var HighBgColor='black';                  // Background color when mouse is over
      var HighSubBgColor='black';                  // Background color when mouse is over on subs
      var FontLowColor='black';                  // Font color when mouse is not over
      var FontSubLowColor='black';                  // Font color subs when mouse is not over
      var FontHighColor='white';                  // Font color when mouse is over
      var FontSubHighColor='white';                  // Font color subs when mouse is over
      var BorderColor='black';                  // Border color
      var BorderSubColor='black';                  // Border color for subs
      var BorderWidth=1;                        // Border width
      var BorderBtwnElmnts=1;                  // Border between elements 1 or 0
      var FontFamily="arial,comic sans ms,technical"      // Font family menu items
      var FontSize=9;                        // Font size menu items
      var FontBold=1;                        // Bold menu items 1 or 0
      var FontItalic=0;                        // Italic menu items 1 or 0
      var MenuTextCentered='left';                  // Item text position 'left', 'center' or 'right'
      var MenuCentered='left';                  // Menu horizontal position 'left', 'center' or 'right'
      var MenuVerticalCentered='top';            // Menu vertical position 'top', 'middle','bottom' or static
      var ChildOverlap=.2;                        // horizontal overlap child/ parent
      var ChildVerticalOverlap=.2;                  // vertical overlap child/ parent
      var StartTop=240;                        // Menu offset x coordinate
      var StartLeft=1;                        // Menu offset y coordinate
      var VerCorrect=0;                        // Multiple frames y correction
      var HorCorrect=0;                        // Multiple frames x correction
      var LeftPaddng=3;                        // Left padding
      var TopPaddng=2;                        // Top padding
      var FirstLineHorizontal=0;                  // SET TO 1 FOR HORIZONTAL MENU, 0 FOR VERTICAL
      var MenuFramesVertical=1;                  // Frames in cols or rows 1 or 0
      var DissapearDelay=1000;                  // delay before menu folds in
      var TakeOverBgColor=1;                  // Menu frame takes over background color subitem frame
      var FirstLineFrame='navig';                  // Frame where first level appears
      var SecLineFrame='space';                  // Frame where sub levels appear
      var DocTargetFrame='space';                  // Frame where target documents appear
      var TargetLoc='';                        // span id for relative positioning
      var HideTop=0;                        // Hide first level when loading new document 1 or 0
      var MenuWrap=1;                        // enables/ disables menu wrap 1 or 0
      var RightToLeft=0;                        // enables/ disables right to left unfold 1 or 0
      var UnfoldsOnClick=0;                  // Level 1 unfolds onclick/ onmouseover
      var WebMasterCheck=0;                  // menu tree checking on or off 1 or 0
      var ShowArrow=1;                        // Uses arrow gifs when 1
      var KeepHilite=1;                        // Keep selected path highligthed
      var Arrws=['tri.gif',5,10,'tridown.gif',10,5,'trileft.gif',5,10];      // Arrow source, width and height

function BeforeStart(){return}
function AfterBuild(){return}
function BeforeFirstOpen(){return}
function AfterCloseAll(){return}


// Menu tree
//      MenuX=new Array(Text to show, Link, background image (optional), number of sub elements, height, width);
//      For rollover images set "Text to show" to:  "rollover:Image1.jpg:Image2.jpg"

Menu1=new Array("Home","http://www.dynamicdrive.com","",0,20,138);

Menu2=new Array("News","blank.htm","",2);
      Menu2_1=new Array("General","blank.htm","",5,20,150);      
            Menu2_1_1=new Array("CNN","http://www.cnn.com","",0,20,150);
            Menu2_1_2=new Array("ABCNews","http://www.abcnews.com","",0);
            Menu2_1_3=new Array("MSNBC","http://www.msnbc.com","",0);
                Menu2_1_4=new Array("CBSNews","http://www.cbsnews.com","",0);
                Menu2_1_5=new Array("Canadian News","http://news.bbc.co.uk","",2);
                          Menu2_1_5_1=new Array("Vancouver Sun","http://www.vancouversun.com","",0,20,150);
                          Menu2_1_5_2=new Array("CTV News","http://www.ctvnews.com","",0);
      Menu2_2=new Array("Technology","blank.htm","",3);
            Menu2_2_1=new Array("TechWeb","http://www.techweb.com","",0,20,200);
            Menu2_2_2=new Array("News.com","http://www.news.com","",0);
            Menu2_2_3=new Array("Wired News","http://www.wired.com","",0);

Menu3=new Array("Search Engines","blank.htm","",3);
      Menu3_1=new Array("Altavista","http://www.altavista.com","",0,20,150);
      Menu3_2=new Array("Google","http://www.google.com","",0);
      Menu3_3=new Array("Yahoo","http://www.yahoo.com","",0);

Menu4=new Array("Webmaster","blank.htm","",4);
      Menu4_1=new Array("Dynamic Drive","http://www.dynamicdrive.com","",0,20,180);
      Menu4_2=new Array("JavaScript Kit","http://www.javascriptkit.com","",0);
      Menu4_3=new Array("Freewarejava","http://www.freewarejava.com","",0);
      Menu4_4=new Array("Web Review","http://www.webreview.com","",0);

Menu5=new Array("Other","javascript:top.location.href='blank.htm'","",1);
      Menu5_1=new Array("Author\'s Site","http://www.burmees.nl/","",0,20,140);