JavaScript code for selecting multiple rectangle blocks (simulating the CS structure)

<Base href = "<% = basepath %>"> <meta http-equiv = "Pragma" content = "no-Cache"> <meta http-equiv = "cache-control "content =" no-Cache "> <meta http-equiv =" expires "content =" 0 "> <meta http-equiv =" keywords "content =" keyword1, keyword2, keyword3 "> <meta http-equiv =" Description "content =" this is my page "> <link href =" <% = PATH %>/CSS/font.css "rel =" stylesheet "type =" text/CSS "> <br/> <style type =" text/CSS "> <! -- Body {scrollbar-face-color: # e9f1f7;/* facial color */scrollbar-shadow-color: # d8e2e7;/* bottom right of the inner border */scrollbar-Highlight-color: # ffffff;/* Top left inside the border */scrollbar-3dlight-color: #96 aabd;/* top left of the outer border */scrollbar-darkshadow-color: #96 aabd; /* bottom right of the outer border */scrollbar-track-color: # e2e7eb;/* bottom color */scrollbar-arrow-color: #96 aabd; /* triangle header */background-color: # f1f4f7;} --> </style> <p> <center> <br/> </center> <br/> <! -- <Br/> strat id <input type = text value = "" id = "startid" name = "startid"/> <br/> end ID <input type = text value = "" id = "endid" name = "endid"/> --> <br/>